Burpees. Call me crazy, but I love ’em. Not only do they elicit physiological responses similar to that of all-out cycling sprints (but in a shorter period of time), they’re also kinda fun to do. That ...

You’ll be hard-pressed to find a single exercise that’s more efficient than the burpee. In one (very sweaty) move, it simultaneously strengthens your body, kicks your cardio into high gear, and boosts ...