Comment by ruslan_sure
Comment by ruslan_sure 16 hours 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.
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".