He's best known as the author of The 4-Hour Workweek and The 4-Hour Body, but Tim Ferris holds many interesting titles, including national Chinese kickboxing champion, the first American to hold the Guinness World Record in tango, and, our favorite, "the world's best guinea pig." Ferris has taken it upon himself to try any physical challenge that comes his way. He not only tells you what he learns, but he teaches you tricks to do it faster and make it more fun. You'll learn hacks for climbing the highest mountain, losing weight, increasing your vertical jump, upping your deadlift, running a faster mile, and more. Plus, he just released his latest book, The 4-Hour Chef, revealing his very best healthy cooking shortcuts.
Why you'll love him: "Common drugs with adverse side-effects associated with grapefruit—http://bit.ly/U8MS92"