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RFC 9839 and Bad Unicode

https://www.tbray.org/ongoing/When/202x/2025/08/14/RFC9839
84•Bogdanp•1h ago•17 comments

Manim: Animation engine for explanatory math videos

https://github.com/3b1b/manim
202•pykello•7h ago•41 comments

Rethinking the Linux cloud stack for confidential VMs

https://lwn.net/Articles/1030818/
53•Bogdanp•3h ago•6 comments

Librebox: An open source, Roblox-compatible game engine

https://github.com/librebox-devs/librebox-demo
62•libreboxdevs•3h ago•14 comments

Writing Speed-of-Light Flash Attention for 5090 in CUDA C++

https://gau-nernst.github.io/fa-5090/
22•dsr12•2h ago•0 comments

I Made a Floppy Disk from Scratch

https://kottke.org/25/08/i-made-a-floppy-disk-from-scratch
76•bookofjoe•4h ago•26 comments

Developer's block

https://underlap.org/developers-block/
99•todsacerdoti•5h ago•55 comments

WebR – R in the Browser

https://docs.r-wasm.org/webr/latest/
72•sieste•4d ago•11 comments

You can't grow cool-climate plants in hot climates

https://www.crimepaysbutbotanydoesnt.com/blog/why-you-cant-grow-cool-climate-plants-in-hot-climates
78•surprisetalk•3d ago•22 comments

Lightning declines over shipping lanes following regulation of sulfur emissions

https://theconversation.com/the-world-regulated-sulfur-in-ship-fuels-and-the-lightning-stopped-249445
125•lentoutcry•4d ago•30 comments

Shader Academy: Learn computer graphics by solving challenges

https://shaderacademy.com/
195•pykello•3d ago•46 comments

World Wide Lightning Location Network

https://wwlln.net/
62•perihelions•7h ago•23 comments

450× Faster Joins with Index Condition Pushdown

https://readyset.io/blog/optimizing-straddled-joins-in-readyset-from-hash-joins-to-index-condition-pushdown
6•marceloaltmann•3d ago•1 comments

Show HN: JavaScript-free (X)HTML Includes

https://github.com/Evidlo/xsl-website
181•Evidlo•20h ago•91 comments

David Klein's TWA Posters (2018)

https://flashbak.com/david-kleins-magnificent-twa-posters-404428/
47•NaOH•3d ago•4 comments

Websites and web developers mostly don't care about client-side problems

https://utcc.utoronto.ca/~cks/space/blog/web/WebsitesDontCareAboutClients
35•zdw•9h ago•27 comments

The Fancy Rug Dilemma

https://epan.land/essays/2025-8_FancyRugDilemma
31•ericpan64•3d ago•14 comments

The first Media over QUIC CDN: Cloudflare

https://moq.dev/blog/first-cdn/
263•kixelated•20h ago•101 comments

Nitro: A tiny but flexible init system and process supervisor

https://git.vuxu.org/nitro/about/
209•todsacerdoti•19h ago•76 comments

From M1 MacBook to Arch Linux: A month-long experiment that became permanenent

https://www.ssp.sh/blog/macbook-to-arch-linux-omarchy/
160•articsputnik•3d ago•298 comments

I run a full Linux desktop in Docker just because I can

https://www.howtogeek.com/i-run-a-full-linux-desktop-in-docker-just-because-i-can/
146•redbell•4d ago•91 comments

ArduinoOS (2017)

https://github.com/DrBubble/ArduinoOS
43•dcminter•3d ago•5 comments

My tips for using LLM agents to create software

https://efitz-thoughts.blogspot.com/2025/08/my-experience-creating-software-with_22.html
133•efitz•13h ago•59 comments

The theory and practice of selling the Aga cooker (1935) [pdf]

https://comeadwithus.wordpress.com/wp-content/uploads/2012/08/the-theory-and-practice-of-selling-the-aga-cooker.pdf
54•phpnode•2d ago•27 comments

FFmpeg 8.0

https://ffmpeg.org/index.html#pr8.0
891•gyan•23h ago•184 comments

Top Secret: Automatically filter sensitive information

https://thoughtbot.com/blog/top-secret
108•thunderbong•1d ago•11 comments

The ROI of Exercise

https://herman.bearblog.dev/exercise/
112•ingve•8h ago•132 comments

I'm too dumb for Zig's new IO interface

https://www.openmymind.net/Im-Too-Dumb-For-Zigs-New-IO-Interface/
174•begoon•8h ago•167 comments

Glyn: Type-safe PubSub and Registry for Gleam actors with distributed clustering

https://github.com/mbuhot/glyn
60•TheWiggles•16h ago•10 comments

Echidna Enters a New Era of Symbolic Execution

https://gustavo-grieco.github.io/blog/echidna-symexec/
9•galapago•3d ago•1 comments
Open in hackernews

The ROI of Exercise

https://herman.bearblog.dev/exercise/
112•ingve•8h ago

Comments

donatj•4h ago
> Less pain

Is there anything to back this up? The people I know who work out are always complaining about their muscles and joints.

user68858788•4h ago
Anecdotally, weight training eliminated my chronic shoulder and hip pains from sitting at a desk. I’ve read several similar stories but I’d be interested to see studies on this.
cadamsdotcom•4h ago
Some ways to exercise avoid injury & get results, and some.. don’t.

I’m a triathlete of 4 years now - love to be sore but have never been injured & unable to train.

There are three things you must do:

1. good technique: lift with the right muscles, run at the right cadence & target heart rate.

2. listen to your body when it needs less or more load.

3. treat recovery as equally important as exercise itself. Exercise’s mirror.

That said, instead of actual complaints, your friends might be social signaling! Bringing it up to bond over the joy of exercise. Humans do that subconsciously, and there is a ton of joy to bond over!

donalhunt•4h ago
From personal experience strength training has been key to recovering from injuries (caused by doing stupid things, not exercise itself). So maybe the correlation between exercise and pain is incorrect? The exercise is the cure to the pain...

https://www.researchsquare.com/article/rs-5753318/v1 (pre-print) seems to provide a strong argument for strength training being beneficial. My search was not thorough so likely more studies out there.

chistev•3h ago
https://youtu.be/_fbCcWyYthQ?feature=shared
jajko•3h ago
If folks are regularly sore and their goals are not some lofty races or even higher and further down the progression path, they are doing it wrong.

You should feel the exercise and specific muscles afterwards, sometimes even a day after (like hamstrings and thighs from squats, those don't get much workout during normal life), but after initial beginner phase the continuous long term goal is to get enough workout that muscles are not sore, just notch below. Properly sore muscle needs few days rest, a well used one can be again fully loaded in 48h easily.

And overall definitely less pain or more like 0 pain, ie back from weak core is pretty typical. Another one are knees, but to train knees around some already-damaged tissues is more tricky, but definitely worth it.

After starting weightlifting (on top of some sports like ski touring, climbing, hiking etc) I can handle much more, heavier and longer. Need to move your/friend stuff to another apartment? All day carrying with them feels like mild stretch, compared to them complaining for back pain for another 3 days.

ajuc•3h ago
You don't know you have problems with X if you aren't using X.

If you do nothing for 20 years and then go for a 20km walk - you'll be in pain. But it's the 20 years that caused it, not the 20 km.

donatj•2h ago
Sure, but is the sum of that single day of pain more than the sum of 20 years of pain?
m_fayer•3h ago
For me personally: My fitness routines are regular but sloppy.

I’m often complaining about soreness here, a lightly pulled there, a big joint that needs to be left alone for a few days. It’s annoying but also even kinda satisfying, and I know how to avoid serious injury.

I’m not complaining about lower back pain because my fitness activity has rid me of it. That pain would have stopped me from being able to move easily, work on my cabin, play with children, and would have eventually made me overweight and chronically ill.

The tradeoff is really a no-brainer in my case, and I don’t think my case is so unique.

kelnos•3h ago
There's a difference between soreness and pain. My muscles get sore all the time from exercise, but it's not painful. That soreness just tells me I'm probably going to be a little bit stronger because of the exercise I just did. (Of course it's a continuum: certain higher levels of soreness mean I probably overdid it.)

Joint pain is a whole other thing, though. Usually joint pain means that you're doing some sort of exercise incorrectly, or that you're using too much weight or intensity for your current level of physical fitness. Or you have a previous injury that can't fully heal and there are some exercises that you just shouldn't be doing, but you do them anyway.

But I think the author is talking about less pain in a different way. For example, I threw out my lower back 25 years ago in college, and it's never been the same since. But doing core exercises and strengthening the muscles around that area means much less chance of pain doing regular day-to-day activities.

ruslan_sure•2h ago
Soreness isn't ideal. It won't make you stronger. Actually, it might make your recovery slower.
fercircularbuf•2h ago
First time I've ever heard that soreness = something wrong. Isn't soreness basically guaranteed to some degree if you've done enough work to actually build strength?
beingfit•2h ago
It depends. But as GP also said, it can be because one is not exercising (that part of the body) regularly. Anecdotally, I have seen that soreness is not really observed when exercising regularly. Some aches and a little fatigue? Probably. But not really muscle soreness.
ruslan_sure•2h ago
I suggest reading or listening to Dr. Andy Galpin on this topic.
hatefulmoron•2h ago
> Isn't soreness basically guaranteed to some degree if you've done enough work to actually build strength?

Not really. If you're eating/sleeping well and training consistently it's completely normal to not feel soreness (that is, excluding the immediate discomfort that rapidly subsides). I can't speak for all forms of exercise, but certainly it's normal when lifting weights, even to failure.

That said, if you're just starting out you will notice a lot of soreness. Many people look back on the early DOMS and wish they could feel that sort of "positive feedback" again.

FredPret•1h ago
I noticed that two things make my DOMS disappear like magic:

- eating an shocking amount of spinach (works much better than a magnesium pill)

- some sort of light cardio of the affected muscles after lifting

scotty79•23m ago
> There's a difference between soreness and pain.

Sorry, but overexerted muscle feels exactly the same for me as the one hit with something hard and heavy or one that received a dozen injections that had a bit of tissue damage as a side effect.

> Usually joint pain means that you're doing some sort of exercise incorrectly

Joint and ligament pain means that you do too much of exactly what you are doing and you should do something at least a bit different. There's no such thing as correct or incorrect. You can do literally anything, just not too much. You only need to be careful because for some movements in some people 1 rep is too much already.

cpursley•3h ago
There's a big difference between recovery pain and chronic pain. Also, if someone has joint pain, they are doing the wrong exercises. For example, running trashes my knees, but biking does not. Also, picking up heavy shit (weights - squats and deadlifts) is the only thing that resolved lower back pain (from sitting all day).
j_bum•1h ago
I’m in the same exact boat with deadlifts helping my back pain from my desk job.
scotty79•15m ago
Doing anything more than you should will trash something in your body. How much of something you should be doing? Pain is a good indicator. I you are below 40 you shouldn't feel it at all. If you are above, you should feel it a bit and observe it closely while reducing the load. If it gets weaker with time, you have appropriate load, if it doesn't or gets stronger, your load is still too high.
nottorp•3h ago
Most of those are not actually complaining but bragging.

Sore muscles -> good workout.

ruslan_sure•2h ago
Physical activity triggers the production of endorphins, specifically beta-endorphins, which are natural painkillers.
brightball•2h ago
When you start working out, you will have soreness in your muscles from lactic acid because your body isn’t used to it.

Once you get in a routine of doing it at least twice a week you won’t get that soreness anymore. People who start working out, then miss a month, then start back experience it all the time. Consistency is key.

scotty79•2m ago
When you start drinking something like unsweetened tea, initially it's almost unbearably bitter. But as you drink it long enough, it feels less and less bitter. It didn't get any less bitter, you just impaired your ability to sense this kind of bitterness.

I wonder what happens with muscle soreness. Do they get actually get less sore after consistent exercise? Or do you just blunt your nervous system into not detecting chemical signatures of the damage?

ants_everywhere•1h ago
Every life long runner I know has had a serious knee problem or other injury.

But I think running is higher impact on the body that a lot of of other exercise. You're putting your full body weight on a small area several times a second for many minutes every day.

deinonychus•8m ago
I've wondered about that too.

My personal thoughts and anecdote, assuming you're not talking about the kind of "bro I got in a killer workout yesterday, my biceps are still sore" Delayed Onset Muscle Soreness humblebragging:

I have a controlled autoimmune disorder like arthritis that causes me some joint pain. But it basically goes away if I do regular strength training. If you do strength training or any sport long enough you'll eventually hurt yourself. Usually that's just a pulled muscle because you woke up on the wrong side of the bed and it goes away after a few days. These micro-injuries actually seem to happen to me a lot, probably because of my condition I'm just prone to this stuff. But I prefer it to the pains of inactivity.

Even for people without arthritis, you have a question to answer: which would you rather suffer from? The pains from not working, out like having a weak core and bad posture and the discomfort of being unable to climb a few sets of stairs? Or the pains from working out, like pulling a back muscle because you didn't warm up or some shin or knee pain from too much running?

The answer is obvious to me. You're going to get hurt either way. I'll go with the path that makes me feel better, live longer, look hotter, and is a rewarding challenge.

kobstrtr•4h ago
> that's about 8,500 hours of exercise, or about a year of solid physical activity

These comparisons are crap. You can‘t simply take one year, exercise 24/7, and get your 10 years of life. You have to fit it into life, which is much more time than it seems from claiming it‘s 1 year out of 80.

But it‘s still a good investment! :)

kelnos•3h ago
That's a perfectly valid comparison. A year's worth of hours is still a year's worth of hours, regardless of what time span I spread it over.

We use this sort of formulation everywhere. If I say I work 40 hours a week, no one is going to assume that I start work at 9am on Monday, work non-stop until 1am Wednesday, and then take the rest of the week off. If I say that people spend approximately a third of their lives sleeping, no one thinks I mean that they sleep continuously from birth until they're 30 years old, and then spend the next 60 years awake.

sersi•2h ago
The point is that it's 8500 hours of free time used for exercise. It's time when you're not eating sleeping or working.

So it's not exactly the same. For people who have very little free time due to commute, work, children, etc. It's harder to spend half an hour of free time a day on exerciaing.

I mean I do agree with the premise that exercising is a good return (especially since the better sleep quality should be factored in) but I think the person you're replying to has a point when he says that saying it's one year of life is not really comparable

dahart•22m ago
> You can’t simply take one year, exercise 24/7, and get your 10 years of life

That’s not what he said though. How would you demonstrate that it’s a good investment, do you have an alternative? For the purposes of calculating the ROI it’s a solid 24/7 year of accumulated exercise time. Of course you can’t do it all at once, but that wasn’t the claim. And sure you have to fit it into your life and sure there’s a little extra time go to and from your activities, but the ratio of exercise to time is roughly 1/80. If you exercise 45 minutes a day 3 times a week: 135 minutes out of 10080 minutes ~= 1/80. He said 4 times/week, so maybe he should have said 1.3/80, but that doesn’t actually change the point. Accounting for sleep and more exercise and lots and lots of travel+shower time, maybe it’s even as high as 1/20… still a great investment.

koolba•3h ago
> We know from one study that people who played tennis a few times per week lived roughly 10 years longer than average. So we'll use that value going forward.

There has to be some incredible correlation between having the time and money to play tennis “a few times per week” and being significantly wealthier than the average person. And being wealthy is clearly the healthiest thing you can do.

giantg2•3h ago
Very much this. While tennis has become more accessible and lower cost over time, it has always been an expensive sport.
ceejayoz•3h ago
Honest question: Why?

There's a free court near me, and both balls and racquets can be gotten for peanuts.

cpursley•3h ago
They're talking from a North American perspective (probably). In most of Europe, there are plenty of outdoor and other free exercise opportunity. Another downside of the incorrect build environment (poor city planning) is that Americans simply don't have built-in ways to move their bodies. When I spent time in Eastern Europe, there was literally a free tennis/basketball court across the street. And a variety of other courts, including outdoor gym. And when house sitting around, there was nearly always an outdoor park with greenspace for strolling, exercise. All free.
huhkerrf•3h ago
Well, while we're talking about anecdotes, my neighborhood in a poor Texas town also had a free tennis court. There were a couple more down the road. My in-laws suburb has walking trails end basketball courts.
matthewdgreen•3h ago
If you live in a place with inexpensive land, tennis infrastructure is relatively cheap. If you live in a dense city where space is at a premium, that’s when it gets relatively expensive.
ajuc•2h ago
Wouldn't space be more expansive in Europe with 100 people per km2 than in US with like 40 people per km2?

How come it's the opposite in practice?

anthony_d•2h ago
> How come it's the opposite in practice?

It’s not. “In practice” ≈ “your assumption”

cpursley•2h ago
I think the catch is, Americans have to spend so much time driving for ADLs (activities of daily living) that there is no time to walk over to the local court (if there is one, usually there is not). This is due to the sprawl Ponzi scheme (which spreads everything out). It's also the primary cause behind America's mental health crises (lack of 3rd places, everyone is isolated). And yeah, I'm not talking SF or NYC, but 90% of the rest of the country.
bluGill•2h ago
That is false for every american I know. Driving means less time than transit users in every study I've seen - that time is of course more stressful but we spend less time commuting and thus have more time. Working hours can be longer but for many it isn't much longer.

There are a lot of couch potatoes that don't use their time, but they have it.

ndriscoll•2h ago
It always blows my mind when I see how many subscribers Netflix has. Americans are so busy driving and working that they don't have time to do anything (cook, grocery shop, exercise, etc.). How are 90M households finding the time to watch movies or binge on TV shows?
firesteelrain•1h ago
No idea. I have Netflix but barely watch it.
0_____0•1h ago
Maybe they're not actually watching it. I have read that the content guidance recommends that media produced for Netflix et al. have the action described auditorially as well as visually, so people can follow the plot without actually looking at the screen.
cpursley•2h ago
Are you talking American transit? Because yeah, it sucks. Also, where do you live - SF, NYC?
CalRobert•1h ago
That’s the issue though - bad design is why driving is the only logical choice
bluGill•1h ago
For the purposes of this discussion there is more time to exercise.

Yes transit uses in practice get more, but it is incidental and lower quality exercise than someone who uses their extra time on a well developed gym plan. (There are of courseetransit users with a well developed gym plan)

Jensson•1h ago
Light exercise several times a day is much healthier than a typical gym plan. You don't get as fit, but you are much healthier.
cpursley•1h ago
What? Especially for men, you need to pick up heavy shit. Our bodies are evolved/designed for it. Body weight exercises also work.
CalRobert•51m ago
How so? Both are great but as someone who got light exercise several times a week (bike commuting) it has still been really beneficial to add resistance training.
dahart•55m ago
> Driving means less time than transit users in every study I’ve seen […] we spend less time commuting and thus have more time

Transit is indeed slower, but there are several big assumptions in there that don’t support your conclusion. In the US, only 15% of trips are commuting to work, the majority of trips are shopping, errands, and leisure. People with cars make more trips than transit users, and go out of their way for shopping, errands, and leisure more often, because they can, because it’s “faster” than transit. Driving commuters tend to drive to lunch, while transit commuters tend to bring one or walk. Transit users can sometimes get things done that can’t be done while driving, which can in some cases more than negate the added travel time. I think that’s a minority of transit users, but I spent a couple years commuting by train and working on the train, and I saved a considerable amount of time compared to driving. Because a lot of people spend this “more time” they saved commuting doing more driving for things other than work, drivers don’t actually have more time in practice.

maxerickson•2h ago
I commute like 12 minutes and the stores I shop at regularly are in the middle of the drive. My office is more out of town than most jobs here.
cpursley•2h ago
You are an outlier, majority of Americans live in suburbia with a significant commute. And that sounds like a sweet setup. Mind if I ask where you live? Medium or small sized town?
maxerickson•2h ago
Smaller town.

The average US commute is less than 30 minutes, people aren't spending all that much time. And with a 30 minute commute, they are likely doing the same thing I am, passing by stores that are reasonable for many of their needs.

cpursley•2h ago
Nice. I watched this earlier this morning and think it could be a good solution: https://www.youtube.com/watch?v=SALP9udFpoA
marcusb•1h ago
Grew up in a very poor town in Arkansas. Had a public tennis court literally next door. In the 80s, the tennis court saw frequent use. People would get mad when they lost a match or whatever and hit the balls into our yard.

My grandmother would go collect them, and we always had a basket full of balls by the door.

By the early 2000s, people stopped using the tennis court very often, and the city tore down the chain link fence around the court to use as overflow parking for the adjacent little league fields.

ndriscoll•3h ago
At least in all of the US suburbs I've lived, there's been free tennis courts and a variety of other courts all over the city. The high school down the street from me has 4 tennis courts. I hear them being used all the time when I'm on a walk (incidentally, along a greenway with a shared use walking/bike trail that wraps around the school grounds and connects via a tunnel under a highway to the rest of the city bike trail system).
haswell•2h ago
Chicago has over 100 free tennis courts across the city.

https://www.chicagoparkdistrict.com/facilities/tennis-courts

0_____0•1h ago
Seriously, tennis courts are one of the most popular facilities to include in an urban/suburban public park.
impossiblefork•2h ago
Tennis is very difficult though. One of the highest barrier to entry sports skill-wise.

Non-athletic adult people can't step onto a tennis court and consistently get the ball back to you, even if you hit it to them.

I thought Padel was easy, but when I organized a Padel after-work I saw that that was not reality, and Padel is much easier than tennis.

firesteelrain•1h ago
That’s why people are gravitating towards Pickleball. It has a lower barrier to entry
impossiblefork•1h ago
It's very sad though. Much better to practice so you can play tennis or padel.
firesteelrain•1h ago
I am for whatever keeps people moving
impossiblefork•1h ago
I suppose I can't argue with that.
lapcat•1h ago
Non-athletic adults can't do anything consistently. Which sports do you think are easier? Certainly not baseball or American football. Perhaps soccer, but only because soccer is more generous about inconsistency: play doesn't stop if you lose the ball or kick it inaccurately, as long as it doesn't go out of bounds. On the other hand, non-athletic adults are going to tire very quickly constantly running around the field with no stoppage.
impossiblefork•1h ago
Soccer you play even if you badly, because the ball is on the ground, but playing soccer well is very hard.

Tennis you can't play truly badly since the ball is in the air, so there's a skill floor, probably not too dissimilar from the skill floor required to play baseball.

Some sports that have a lower skill floor than tennis are table tennis, pickeball, badminton, association football and ice hockey. The thing to understand is that it's not about fitness, it's the skill floor. It's that the beginner will miss the ball or not be able to control it.

lapcat•1h ago
> probably not too dissimilar from the skill floor required to play baseball

I think baseball requires significantly more coordination than tennis.

Moreover, baseball (as opposed to just playing catch with a baseball) requires two whole teams, whereas tennis can be played with only two people.

> ice hockey

[John McEnroe voice] You cannot be serious

Ice skating by itself is difficult for beginners. They fall all over the place. Ice skating while trying to follow and control a moving puck is even more difficult.

> it's not about fitness

Ok, but in the current context, the ROI of exercise, it's all about fitness. What's the fitness ROI from table tennis or badminton? Even pickleball tends to be less exercise than standard singles tennis. And in baseball too, there's a lot of standing around and sitting (when your team is at bat). I would say that in terms of exercise, singles tennis has one of the best ROI. (Doubles not so much.)

koolba•21m ago
> whereas tennis can be played with only two people.

Or even just one and a brick wall.

kqr•1h ago
Tennis requires a certain proficiency to have fun with. Beginners tend to have trouble getting the ball reliably across the net onto the other player. This proficiency takes time to build. Thus, unless one makes a big up-front time investment, tennis is not particularly good exercise. Up-front time investments are expensive.

Also one cannot tennis alone. Anything one must practise with a partner is more expensive due to scheduling requirements.

lapcat•44m ago
The OP was talking about monetary wealth. Here you're redefining "expensive" to mean something other than wealth, i.e., time.

Also, the whole point of the submitted article is that the investment of time into exercise is totally worth it.

Yes, there's a learning curve to tennis, as with any sport. You could just go jogging/running by yourself, but the advantage of sports, including tennis, is that they're usually a more fun and less boring form of exercise than jogging/running by yourself. If exercise is fun, then you're more likely to stick to it rather than skipping it.

YetAnotherNick•33m ago
> "expensive" to mean something other than wealth, i.e., time.

I don't think they did say that. They just said wealthy people have more freedom on schedule that non wealthy people.

lapcat•25m ago
> They just said wealthy people have more freedom on schedule that non wealthy people.

I'm not sure that's true though, unless by "wealthy" you mean trust fund kids. But there are millions of tennis players of various levels of income. A lot of salaried workers in upper income brackets work more than the usual 40 hour week, have less free time.

I'm guessing these engineers weren't playing a lot of tennis: https://www.folklore.org/90_Hours_A_Week_And_Loving_It.html

GuB-42•18m ago
Tradition, mostly. Tennis is seen as an upper class sport and prices will be set accordingly, it is not the case everywhere though.

Another reason is that a tennis court takes significant space for just 2 (or 4) people. So unless it is subsidized, when land is at a premium like in a large city, it is going to be expensive.

esperent•3h ago
> has always been an expensive sport

Since I've been a child, living in multiple countries across Europe and Asia, there's always been either free or cheap tennis courts near me. I don't even play tennis much and I know this, I'm sure if I was searching I'd find way more low cost options.

It's more likely that the demographic who play tennis tends to be wealthy, rather than the sport itself being expensive.

flatb•2h ago
The Williams sisters started playing tennis in Compton. Tennis is cheap, but not so culturally accessible.
esafak•1h ago
I just charge it to the Underhills.
javier2•3h ago
Also, if you have health issues, you will not be playing tennis twice a week. Plus tennis is on the expensive to stay active in when you need a club membership and courts to play.
bluGill•2h ago
Every town I've lived in has free courts in a park that anyone can use.
rs186•2h ago
These days they are often repurposed for pickleball in the US.
firesteelrain•2h ago
Pickleball nets are often portable and good co use with Tennis courts. That’s what we do

Plus pickleball is popular so you will find more people to play with

lapcat•1h ago
Yes, that has become a problem for tennis players, but it's a quite recent problem. Before pickleball became popular, though, free public tennis courts were widespread in urban and suburban areas. Perhaps not in rural areas, though I can't speak definitively on that.
GLdRH•28m ago
Then just play pickleball. It's virtually the same thing for the topic at hand.
827a•40m ago
I have a friend who, when you bring up exercise in any capacity, how good it is for you, anything about it, even if its just how I did it, he has to find some way to twist it so it can't be good. This thread is so reminiscent of conversations with him.

"Tennis is great for you" "there's probably a correlation with being rich" "Also unhealthy people don't regularly play tennis so there's survivors bias". "But there's free courts" "Nope they turned those into pickleball courts" "Wake up at 4:30am and go for a run" "Bro if youre waking up at 4:30 when are you going to bed" etc

People will find any reason they can to be unhealthy. Its better to just not engage with them.

dfee•16m ago
Exactly. Now, time to go crank some calisthenics in my garage - for free.
scotty79•37m ago
Never seen a free tennis court in my life. I've seen plenty of paid ones though.

Did every city you lived it had a free golf course as well?

GoRudy•1h ago
Depends on the health issues. In the US, northeast and Florida at least there are many free courts almost everywhere. And plenty of older folks with small or medium health issues still find the time and motivation to play.
almost_usual•1h ago
There are plenty of wealthy people who are unhealthy.

Wake up at 4:30am and go for a run. You’re already accomplishing more at that point in the day than most wealthy people who are comfortably laying in bed.

The hard thing is doing the thing. Just do, that’s it.

seeEllArr•1h ago
Don't wake up at 430 unless you went to bed early. A full night of sleep is crucially important.
kqr•1h ago
You seem to be forgetting that insufficient sleep is also unhealthy.
almost_usual•25m ago
Nope. I get 8-7.5hrs every night. I’m asleep within 15 minutes, zero screen time.
robenkleene•1m ago
Where are you getting 7.5-8 hrs? 9:30 PM to 4:30 AM (per your other comment ) with 15 minutes to fall asleep is 6.75 hrs of sleep (which would put you as a genetic outlier if you can function without measurably consequences with that little sleep.)
aeve890•1h ago
>Wake up at 4:30am

About that, what hours people that wake up at 4.30 am go to bed? If they're so conscious about their well being I'd assume at least 8 hours of sleep, so maybe they go to bed at... 8~9 pm? my question is what do they do to end their day at 9pm? If you work 9-5, you have just 4 hours left after work. Less if you commute, have dinner and a "go to be" routine of maybe 30 min. How about social life after work? Run errands? In my case, if I need to do anything out of my house it has to be after work hours (because almost everything is closed between 6am and 9am when I start work).

So, what's the secret?

marcusb•36m ago
>So, what's the secret?

There isn't one. Its a trade-off. I get up between 4:15 and 4:45 (depending on the day) to exercise. I go to bed between 9 and 10 pm (usually 9:30.) I exercise with a group of people, and that ends up being most of my socializing time. 5 - 9 is family time.

almost_usual•29m ago
I incorporate errands into my schedule. When I walk home from work from the train station I will stop by the local grocery store to pick up anything that is needed.

My employer is fine with me working from the train to and from work. I get there early and I leave early.

Weekends are arranged to buy other items in bulk.

My bed time routine is probably 15 minutes of reading a book before I fall asleep.

engeljohnb•13m ago
I go to bed at 8-9pm and get up at 4:30.

My fiance and I don't have kids. I'm sure this is the biggest factor to allow me to live by this schedule.

Having a short commute helps a lot obviously, but I still was able to keep this schedule back when I had an hour commute. Back then, if we had even one errand to run after work, it was straight to bed when we got home, so we usually tried to keep errands to the weekend. Even if we had no errands, a lot of days we only had time to cook dinner and watch an episode of the Office.

Now we have a 10min commute, so after work we have time for an errand or two, then go to the gym, then we can even watch movie or something before bed.

I cook easy meals, things that don't take long and don't require more than a pot or a skillet. I don't mean microwave garbage or instant ramen either. I mean things like soups and beer-steamed sausage.

However, this usually leads me to eating the same few meals over and over. If I ever want more variety, I meal-prep on the weekend.

My fiance and I don't usually clean on weekdays. We probably live like slobs by some people's standards, but we're never more than 20min from a clean house.

As for social life... All of our friends live too far away to see them on weekdays anyway.

YetAnotherNick•36m ago
> There are plenty of wealthy people who are unhealthy.

No one said correlation is 1. It's just on average wealthy people live longer.

throwaway22032•1h ago
If you're disciplined enough to put something in your calendar and do it over a period of months, without someone breathing down your neck to do so, whether you feel like doing it or not, then you are likely able to apply that effort in other areas of life.

So then it's a bidirectional correlation. You're more likely to be fit if you are wealthy and more likely to be wealthy if you are fit.

Essentially, what you're looking at is that people who engage in self improvement end up better off than those who don't.

It's a priori obvious but some people are uncomfortable with it for some reason - trauma response / coping mechanism, something like that.

tonyedgecombe•55m ago
I've never really bought this argument. The average American spends five hours a day watching TV.
credit_guy•29m ago
Exactly. Some guy once told me that "research" shows that people who play golf live longer. I still didn't pick up the sport yet. Not sure I'll pick it up anytime soon, although I like the idea of living longer.
hombre_fatal•9m ago
I am begging HNers to at least pull up the study in scihub and see if there was multivariate adjustment (there was) before they hip-fire the first thought they had when they saw someone summarize a study in a blog post.
chaostheory•3h ago
If you’re struggling with exercise and with getting it into a routine, I can’t recommend standalone, wireless VR enough. It was fun and engaging enough to keep me coming back without feeling that I was doing a boring chore, and nearly every game has you moving, with the exception of the flying and driving sims.

Imagine fighting ninjas and dodging bullets as your workout. You can literally get that and more with VR.

It was my gateway back into fitness.

Maximus9000•2h ago
Can you recommend any specific games that meet these requirements? I don't have VR, but I remember playing "Super hot VR" and getting a surprisingly good workout from that game.
carpool4268•2h ago
It sounds like they're talking about pistol whip.

If I can promote one myself, Synth Riders can be a hell of a workout. People like comparing it to beat saber. Unlike beat saber, there's no swords, so there's a lot less wrist movement and a lot more arm/full-body movement. It feels a lot like dancing while you're doing it. I'm no great fan of exercise, but if I'm not careful I can exercise myself deep past exhaustion in this one -- especially on the harder difficulty charts.

And beyond that there's a mode where you punch the notes instead of trying to catch them. I haven't tried it, but that sounds even more demanding.

But aside from anything else, it's just fun! Great option for training cardio, it really works out the arms.

ajuc•2h ago
Or you know just get audiobook on your phone and walk.
JKCalhoun•1h ago
Stepmania [1] (open DDR clone) just requires a (decent) dance pad, no VR. That's as good a work you as you'll get from a game, I suspect.

[1] https://www.stepmania.com/download/

liampulles•1h ago
I'm curious about this so I hope you'll indulge a few questions:

1) What kind of free space do you need? 2) What would you recommend in terms of headset if one plans to be swinging around a lot?

mehulashah•3h ago
100%. There’s no point in nitpicking on this post. There’s an outsized return on exercise and it’s measurable. People don’t get — especially young people — that exercise is like eating, sleeping, and pooping. Your body needs it in regular intervals otherwise its carefully balanced system goes out of whack.
heresie-dabord•2h ago
Further, people don't know enough about the deadly effects of obesity, high blood pressure, and the big killer:

https://en.m.wikipedia.org/wiki/Atherosclerosis

Exercise is vital!

"Atherosclerosis generally starts when a person is young and worsens with age. Almost all people are affected to some degree by the age of 65. It is the number one cause of death and disability in developed countries. Though it was first described in 1575, there is evidence suggesting that this disease state is genetically inherent in the broader human population, with its origins tracing back to CMAH genetic mutations that may have occurred more than two million years ago during the evolution of hominin ancestors of modern human beings."

marcogarces•3h ago
"what is pain? French bread!"
ruslan_sure•2h ago
Physical activity increases lifespan primarily by lowering the likelihood of falling and breaking your hip. If you break your hip, your life expectancy is dramatically reduced. If that's your goal, just train your legs!

That said, I think the most important part of exercising is the mental boost it provides. It's like a healthy drug. There are no negative side effects, and it's highly praised by society.

dachris•2h ago
That's certainly not the only (and I'd also not put it as primary) reason for extending the lifespan.

Still, breaking one's hip in advanced age is often a death sentence as many people never get out of bed again.

When an old person breaks their hip around here, people say something along the lines of "we'd better hurry up for visiting them one last time".

DebtDeflation•1h ago
There's also a lot of reverse causation here. Healthy people don't fall very often and when they do they generally don't break their hips. Falling frequently and suffering broken hips when falling are both general signs of poor systemic health and overall fragility which portend a short remaining lifespan regardless.
firesteelrain•1h ago
You aren’t wrong. Train your legs and walk. Don’t sit in the recliner when you retire. 7000-10000 steps a day helps
megaloblasto•26m ago
True, however I know a lot of people over 60 who think that walking alone is sufficient. You need to strength train too. Train your abs and at least do body squat variations. Walking is great to lose weight and keep your heart healthy, but not sufficient in itself.
tonyedgecombe•51m ago
Interestingly for many people the break precedes the fall.
koolba•11m ago
> If that's your goal, just train your legs!

This should be easily confirmed by analyzing life expectancy of people with squat toilets vs a traditional western camode.

almost_usual•2h ago
The mental toughness, discipline, and higher energy levels that come with exercise are more important to me than physical appearance or living longer, and at this point almost anything else in life.

Wake up at 4am, run hill repeats for miles and then go into work. I guarantee no incident or colleague will trigger a stress response. You will feel as cool as a cucumber and when an urgent issue does come up you will handle it with absolute mental clarity. That afternoon drowsiness will also not hit you at all, counterintuitive right?

By 9pm you will fall asleep no matter what happened that day.

This kind of work gives you an edge on everyone. You look at things and say, “shit this is easy compared to what I did this morning” and you will feel mentally fresh.

weregiraffe•2h ago
By 9pm? A lot of people will need to go to bed at 8pm to survive this schedule.
p1esk•1h ago
I wake up at 7am, take kids to school, go to a gym 8-9, go for a swim in the ocean 9:15-9:45, start working at 10. Feel great.
porridgeraisin•1h ago
I always wondered how routines like this work (not the activities themselves, but the timings)

If you swim till 9.45, how are you out, bathed, dried, changed, home, and at your table by 10?

zoover2020•1h ago
Amen. What is the routine that works for you?
Schiendelman•1h ago
I usually lift rather than run, but I do the same thing, and it has changed my life. Up at 4 every day, and lift at 5. It makes everything else easier, I agree.

I do get in bed at 7:30p most nights and read, to ensure my body has the choice to get 8h of sleep.

isaacremuant•2h ago
"hackernews" the self help site always rings so hollow.
lazarus01•1h ago
I can share a very simple incentive for exercise.

As you age, you will lose lean muscle and bone density. But you do have some control in maintaining a healthy level of strength for your elder years.

You can maintain strength and density by engaging in resistance training.

The total amount of training required is up for debate. I follow Dr. Peter Attia and he discusses needing about 1 hr a week of resistance training.

The other aspect of maintaining strength is protein intake. Dr. Attia describes it as a “chore”, that is to consume 1g of protein supplement for each pound of body mass. That’s a lot!

Think about your future, do you want to be strong and mobile into your later years? I see older unhealthy people walking the streets and don’t envisage myself letting that happen.

You must take good care of yourself and put in the time to exercise and eat properly.

CalRobert•1h ago
I am embarrassed to admit I always thought people focused too much on protein and it was bro science but I also never managed to get stronger despite resistance training. Then in my forties I finally started eating 150-180 g of protein a day and doing resistance training to exhaustion a couple days a week and the difference has been huge. I wish I’d done this 20 years ago.
lazarus01•1h ago
That’s fantastic! Don’t beat yourself up. What’s important is that you're taking good care of yourself today! You took control!
hombre_fatal•3m ago
I'm 6'1 and 190-200lb, and I went from 130g to 80g a day of protein for the last year and have only gained more lean mass since I exercise daily.

I do think proteinmaxing is mostly food/supp industry hype + advice for people who need to tricked into replacing donuts with something healthier. So YMMV.

But I think the training until exhaustion part of your comment is the important bit.

reckoner99•1h ago
To me, exercise is compounding in action. Each workout may feel small in isolation, but like interest accruing, the benefits multiply invisibly over years. Extra vitality today, resilience tomorrow, and ultimately, more time across decades.
Balgair•1h ago
Anecdata:

I hated exercise. Still do. People talk about a glow or a good feeling after exercise. My SO does too. I never felt it.

Until I dieted down to being 'at weight' not overweight. Only then did it feel good to exercise, and only then after I exercised. The act itself is still a terrible experience.

I've put on weight again and, yep, I hate exercise now. But now I know there is a light at the end of the dieting and weightless tunnel. Without the experimental results, I would never have known.

So, its not that I don't trust the science here, I mean, how can I refute it? It's just that my lived experience says that I'm a freak and I'm sitting out on the end of some bell curve or whatever. I know that it got a high ROI, that's why I did these weight loss experiments in the first place. It's just that for some reason, my body and mind hate exercise until I get down to healthy levels.

Thanks for letting me share this.

speedgoose•56m ago
You may want to find some activities you enjoy while doing them.

I don't know what you tried, but sometimes a small variation is enough to make it fun and rewarding during the exercise. For example, I find slow road running pretty boring. The only value is doing exercise and relaxing my brain. I gave up many times. But replace the roads by challenging technical single tracks, and I'm very happy and havn't gave up in years.

scotty79•29m ago
I hate exercise and I can't even imagine doing it in the morning because it just makes me tired and sleepy. After two hour bike ride or 3 hour walk, I just drop and fall asleep in the middle of the day messing up my sleep schedule. Somehow I feel that even for the author of this article exercise would feel different if he wasn't chasing it up with 45 minutes of binging coffee.
simonebrunozzi•49m ago
What a sloppy article.

Correlation is not causation. All credibility is lost for this guy, in my view.

> We know from one study that people who played tennis a few times per week lived roughly 10 years longer than average. So we'll use that value going forward.

This is the study [0]. The study itself, in the conclusions, states that:

"Conclusion: Various sports are associated with markedly different improvements in life expectancy. Because this is an observational study, it remains uncertain whether this relationship is causal."

Has the author read the study at least?

[0]: https://pubmed.ncbi.nlm.nih.gov/30193744/

Herring•13m ago
Advising people to exercise doesn't work and doesn't scale. Gyms are for people who have plenty of intrinsic motivation and money and time.

To improve physical activity at the population scale and over a lifetime, it literally has to be built into the design of the cities, so people have no choice but to walk to work or get groceries.

https://www.youtube.com/watch?v=KPUlgSRn6e0&ab_channel=NotJu...

https://cs.stanford.edu/people/jure/pubs/activity-inequality...