When I worked the kitchen back in the Formula 47 days, the shortening came in 50 pound blocks that needed to be moved around and dumped into the fryers. That's what came to mind first.

That's roughly the weight of a small child or the torsional force required to drag an average sized male on grass.

That's the weight of a Fully loaded suitcase for a flight.

I mean, it's a fraction of the linear force required to push a stalled sedan and about the necessary force to remove, maneuver, or install a car battery

Lifting 50 lbs should be a general societal requirement. Thanks McDonald's for stating the obvious.