The human body can go either way, depending on how you use it. If you get off your ass and actively seek out pain, the body is antifragile, meaning it gets stronger the more stress and strain you put on it. The breaking down of your body through exercise and physical labor builds muscle and bone density, improves circulation, and gives you a really nice butt. But if you avoid stress and pain (i.e., if you sit on your damn couch all day watching Netflix), your muscles will atrophy, your bones will become brittle, and you will degenerate into weakness.
