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Exercise is a relatively recent phenomenon. After all, it\\u2019s difficult to imagine a caveman on a treadmill. And it\\u2019s 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.

But why do we spend so much time and money at the gym or on the track and does it actually help our well-being? And why is exercise, at least for some of us, such a miserable experience?

Daniel Lieberman, professor of human evolutionary biology at Harvard University and author of the book \\u201cExercised: Why Something We Never Evolved to Do Is Healthy and Rewarding,\\u201d has some fascinating answers.