Tossing a single match on a pile of wood won't ignite a strong flame. An entire box of matches, however? That's the start of a kick-ass bonfire.

This is the sort of fiery result that your internal fat burners will get from the fast-paced intervals in this workout a series of high-powered, total-body exercises. "This heart-pumping circuit packs in explosive movements in multiple directions, which activates your fast-twitch muscle fibers," says certified strength and conditioning specialist B.J. Gaddour, CEO of StreamFit.com, who created this workout. Why that matters: Fast-twitch fibers burn calories at a faster rate than slow-twitch fibers; add in the fact that you're engaging nearly every major muscle group, and the result is a supercharged metabolism during and after your workout.

Perform each exercise as a one-minute interval: Do as many reps as you can in 30 seconds, then rest for 30 seconds before continuing to the next move. Rest one minute at the end, then repeat the circuit two more times. If you're not time-crunched, perform up to six intervals for a 30-minute workout.