The 4-hour Body

Tim Ferriss's 2010 guide focuses on diet, with chapters on exercise, sleep and sexual performance, drawn largely from experiments he ran on himself. Ferriss describes methods he tested, and others he learned from doctors, athletes and researchers, for losing fat, gaining muscle, improving sleep and building strength and endurance. He presents his slow-carb diet among other approaches and encourages readers to track their results and choose the parts that fit their goals. Some of its claims have been disputed.

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Shane Parrish: “If you’ve resolved to eat healthier and get into better shape this year, start here”