Includes bibliographical references (pages 343-417) and index.

1. Are We Born to Rest or Run -- Part I: Inactivity -- 2. Inactivity: The Importance of Being Lazy -- 3. Sitting: Is it the New Smoking? -- 4. Sleep: Why Stress Thwarts Rest -- Part II: Speed, Strength and Power -- 5. Speed: Neither Tortoise nor Hare -- 6. Strength: From Brawny to Scrawny -- 7. Fighting and Sports: From Fangs to Football -- Part III: Endurance -- 8. Walking: All in a Day's Walk -- 9. Running and Dancing: Jumping from One Leg to the Other -- 10. Endurance and Aging: The Active Grandmother Hypothesis -- Part IV: Exercise in the Modern World -- 11. To Move or Not to Move: How to Make Exercise Happen -- 12. How Much and What Type? -- 13. Exercise and Disease.

"This highly engaging landmark work, a natural history of exercise--by the author of the best seller The Story of the Human Body--seeks to answer a fundamental question: were you born to run or rest? The first three parts of Exercised roughly follow the evolutionary story of human physical activity and inactivity, even as each chapter shatters a particular myth about exercise. Because we cannot understand physical activity without understanding its absence, Part One begins with physical inactivity. What are our bodies doing when we take it easy, including when we sit or sleep? Part Two explores physical activities that require speed, strength, and power, such as sprinting, lifting, and fighting. Part Three surveys physical activities that involve endurance, such as walking, running, or dancing, as well as their effect on aging. Part Four considers how anthropological and evolutionary approaches can help us exercise better in the modern world. How can we more effectively manage to exercise, and in what ways? To what extent, how, and why do different types and durations of exercise help prevent or treat the major diseases that are likely to make us sick and kill us? -- Provided by publisher.