NPR

'Exercised' Explains Why It Can Be Hard To Commit To Working Out — And Why We Should

Harvard University's Daniel Lieberman looks at exercise from an evolutionary point of view, concluding that we evolved to limit our physical activity where possible, saving it for survival activities.
<em>Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding,</em> by Daniel E. Lieberman

How many steps do you walk each day?

If you live in the U.S. and can claim more than 4,774 steps daily, you're exceeding the average American's total. Comparable figures from England and Japan are 5,444 and 6,010 daily steps, respectively — with this info derived from cellphone data.

The distance that individuals walk daily varies, with a host of factors affecting the total, including where you live, what work you do and whether you are able to walk at all. In a riveting book published Tuesday, , Harvard University evolutionary biologist Daniel E. Lieberman cites the step data to make a point. Many

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