Why is physically exerting yourself to the point of exhaustion at the gym good for you but various jobs involving manual labor seem to cause permanent damage in the long term?

Question

Why is physically exerting yourself to the point of exhaustion at the gym good for you but various jobs involving manual labor seem to cause permanent damage in the long term?

In: Biology

Answer 1

To be fair, physically exerting yourself through sport or exercise isn’t necessarily a good thing either. Lots of weightlifters and runners have messed up joints.