Exercise does cause damage to your body, both structural and oxidative. Fortunately, that damage triggers repair mechanisms which make you stronger than before.

Exercise does cause damage to your body, both structural and oxidative. Fortunately, that damage triggers repair mechanisms which make you stronger than before. See http://en.wikipedia.org/wiki/Hormesis#Physical_exercise http://en.wikipedia.org/wiki/Hormesis#Physical_exercise An aside: Reading this article made me wonder why I tasted blood after particularly hard workouts. Apparently the heart can pump with enough pressure to rupture some of the capillaries in your lungs. A tiny amount of blood leaks out and gets aerosolized. At least, so says this paper: http://abughrai.be/Vulnerability%20of%20pulmonary%20capillaries%20during%20severe%20exercise%20821.full.pdf http://abughrai.be/Vulnerability%20of%20pulmonary%20capillar...