Whats the point of exercise?
Exercise is a relatively recent phenomenon. After all, its difficult to imagine a caveman on a treadmill. And its safe to say that paleolithic humans never pumped iron. But something changed as we moved from the plow to the Peloton. Exercise  physical exertion for the purpose of improving health or fitness  became a huge part of modern life, and a nearly $100 billion global industry. Daniel Lieberman, professor of human evolutionary biology at Harvard University and author of the book Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding, has some fascinating answers. Three Takeaways: