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Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding, by Daniel E. Lieberman

Endorphins. Endorphins are natural opioids that help us tolerate the discomfort of exertion.22

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Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding

Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding

by Daniel E. Lieberman

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