Статия, която обяснява, ама наистина, защо е хубаво да се спортува:

Dr Levine and her team were testing a theory that exercise works its magic, at least in part, by promoting autophagy. This process, whose name is derived from the Greek for “self-eating”, is a mechanism by which surplus, worn-out or malformed proteins and other cellular components are broken up for scrap and recycled.

Exercise and longevity: Worth all the sweat | The Economist.