Stuffed with short man memos, line drawings of knives, steels and 3/4 horsepower blenders, and the correct form for pushups, burpees and squats, REFUEL [$25] boosts men’s testosterone levels naturally, and improves strength and stamina. Although you won’t need it in the cave, the chapter on how to eat out healthier–whether fast food, Italian or fine dining— is worth the price tag all by itself. The 24 day fat loss plan counts on just two days per week of eating lean, and going easy on foods you can crumple or crush: it isn’t uber. Author Dr. John La Puma MD is a New York Times best-selling author twice, and a PBS host. He helps men and women refuel in Santa Barbara, California.

Buy: Refuel Men