The Skeptics Society & Skeptic magazine

In episode 150 of The Michael Shermer Show, Harvard professor of human evolutionary biology Daniel Lieberman discusses his pioneering researcher on the evolution of human physical activity in his book Exercised: Why Something We Never Evolved to Do is Healthy and Rewarding. PLUS: Perhaps one of the most bizarre beliefs rampant in modern times is that malign, shape-shifting reptilian extraterrestrial invaders, disguised as human beings, secretly control the governments of the world. It is possible that we recently experienced a violent consequence of that belief.

In episode 150 of The Michael Shermer Show, Harvard professor of human evolutionary biology Daniel Lieberman discusses his pioneering researcher on the evolution of human physical activity in his book Exercised: Why Something We Never Evolved to Do is Healthy and Rewarding. Using his own research and experiences throughout the world, Lieberman recounts how and why humans evolved to walk, run, dig, and do other necessary and rewarding physical activities while avoiding needless exertion.