1 of 9 No Time For A Full Workout Today? Squeeze in this fast and furious fat blaster, designed to work every major muscle while burning mega calories. “Every move here is explosive — you’re working different muscle groups in a variety of directions for optimum conditioning,” explains New York-based trainer Holly Rilinger. Do each move for 30 seconds, resting as little as possible (up to 10 seconds) between each one. “Because you’re rotating between lower body, upper body, and core moves you’re already getting rest, so you can keep downtime to a minimum,” adds Rilinger.