We know we need to put on our running shoes and hit the pavement, but staying in bed is so much more attractive. Blame evolution. Daniel E. Lieberman, professor of human evolutionary biology at Harvard University, joins host Krys Boyd to talk about why we exercise and how that’s changed, the myths and realities of its benefits, and helpful motivations for getting off the couch. His book is “Exercised: Why Something We Never Evolved to Do is Healthy and Rewarding.”