Thanks!

I once carried a log that weighed about double my body weight and carried it 100ft. My back has never been the same, I really don't recommend it unless you know what you're doing.

No, I don't think I will

One thing I always found a bit of a puzzle: it's widely understood, and scientifically backed up afaik, that strength training is healthy and good for longevity. Yet, if you look at people whose everyday jobs look a lot like functional strength training, eg construction workers, my general impression is that their bodies are in worse condition than the average population (who's not in great shape already), and far worse than people with sedentary jobs who do fitness training.

I get that there can be too much of a good thing etc, but I still find it curious. If it's generally said to be good for you, shouldn't the effects be a bit more robust than that?