Today, most of us tend to medicalize exercise, turning it into something that we “have” to do. Case in point: the treadmill. If our main goal was enjoyment, there’s no way we’d regularly spend 45 minutes walking in place on these expensive machines.

But our relationship with exercise — or, more generally, physical activity — was not always so discrete and joyless. For much of human history, people got plenty of physical activity by not only walking long distances, but also by doing activities that were both necessary and socially rewarding, like hunting, dancing, and sports.

Harvard biologist Daniel Lieberman argues it’s time to rethink our relationship with exercise, and to understand physical activity as a complex and integral part of human evolution. After all, while walking thousands of steps through the environment to find our next meal was a major part of our evolution, walking on the treadmill was not.

1:54 Exercise vs physical activity

2:40 Why exercise stresses us out

3:12 “Medicalizing” exercise

3:48 The 10,000 steps myth

5:02 Warrior origins of exercise

6:12 Aggression: Proactive vs. Reactive

7:15 The anthropological view

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About Daniel Lieberman:

Daniel Lieberman is Edwin M. Lerner II Professor of Biological Sciences and a professor of the Department of Human Evolutionary Biology at Harvard University. He received degrees from Harvard and Cambridge, and taught at Rutgers University and George Washington University before joining Harvard University as a Professor in 2001. He is a member of American Academy of Arts and Sciences. Lieberman loves teaching and has published over 150 peer-reviewed papers, many in journals such as Nature, Science, and PNAS, as well as three popular books, The Evolution of the Human Head (2011), The Story of the Human Body: Evolution, Health and Disease (2013), and Exercised: Why Something We Never Evolved to Do is Healthy and Rewarding (2020).

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