Just Move

For much of history, human beings needed to be physically active every day in order to hunt or gather food — or to avoid becoming food themselves. It was an active lifestyle, but one thing it didn't include was any kind of formal exercise. Daniel Lieberman is a professor in the department of human evolutionary biology at Harvard. 

He says that the notion of "getting exercise" — movement just for movement's sake — is a relatively new phenomenon in human history. 

 Lieberman has spent a lot of time with indigenous hunter-gatherers in Africa and Latin America, cataloging how much time they spend walking, running, lifting, carrying and sitting. He writes about his findings, as well as the importance of exercise and the myths surrounding it in his new book, Exercised.

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