Exercised: why something we never evolved to do is healthy and rewarding

Are we born to rest or run?

Inactivity. Inactivity: the importance of being lazy ; Sitting: is it the new smoking? ; Sleep: why stress thwarts rest

Speed, strength, and power. Speed: neither tortoise nor hare ; Strength: from brawny to scrawny ; Fighting and sporting: from fangs to football

Endurance. Walking: all in a day's walk ; Running and dancing: jumping from one leg to the other ; Endurance and aging: the active grandparent and costly repair hypotheses

Exercise in the modern world. To move or not to move: how to make exercise happen ; How much and what type? ; Exercise and disease

Epilogue.