Exercise Promotes Longevity. Evolution Explains Why.

Breaking down the 'active grandparent hypothesis.'

In his book “Exercised: why something we never evolved to do is healthy and rewarding”, evolutionary biologist Daniel Lieberman coins a term — exercists — which he broadly defines as people who espouse the benefits, joys, and importance of regular exercise, sometimes to a fault. 

We all know those people, perhaps we are those people, who talk nonstop abo…