Combat calories to win the battle of the bulge Fitness training in the armed forces is so much more than the "drop and give me 20" cliché (though, yes, pushups are involved). Workouts tax strength, sure, but most important is endurance for those long hikes decked out in full gear. So what does this mean for you? A total-body training circuit that's a real calorie killer. Do each exercise for 30 seconds then go right to the next one, resting only when needed and for 30 seconds between sets. Think you got three circuits in you? Go for four. -Amy Roberts, NASM MOVE 1: Half-Burpees Crouch down with your hands on the floor on either side of your feet (A). Jump your feet out so you're in a plank position (B), then quickly jump them back in (C). Feeling strong? Add a straight jump after you hop your feet in and turn the move into a full burpee. MOVE 2: Bicycles Flip over onto your back. Bend your knees in and place your hands behind your head, elbows straight out to the sides (A). Lift shoulders and feet off the floor, and bring one knee in toward your chest while turning your shoulders to bring the opposite elbow to touch the knee (B). Alternate sides, going quickly, but without sacrificing your form—the whole shoulder unit should be turning, not just the arms flapping in and out (C). MOVE 3: Military-Press Jacks Add a little weight for this modified jumping jack. Hold a 5-pound dumbbell in each hand, elbows bent, forearms vertical, hands in front of your chest (A). Jump out into a straddle with your legs, while you press your hands straight up above your head with your hands facing in (B). Bring your hands down as you jump your feet together. Repeat as fast as you can while going through the full range of motion. MOVE 4: Woodchopping Squats Bring the dumbbells together in both hands. Set your stance so feet are shoulder-width apart, toes slightly turned out, then raise the weights up, over, and behind your head, bending your elbows (A). Sit back and down into a squat, bringing the weights down in front of you in a chopping motion, finishing with arms between your knees (B). As you press up to stand, raise the weights back up to the starting position. Repeat at a fast clip, watching your form. MOVE 5: Up-Up-Down-Downs Come down into a plank on your forearms, toes tucked, elbows under shoulders, and hips at the same height as shoulders (A). Pick up one arm and press that hand into the ground toward a high, straight-arm plank (B); do the same action with the other hand to complete the transition from low plank to high (C). With the lead arm, lower back to your forearm, then follow with the other hand (D). Repeat on this side for 15 seconds, then change it up and lead with the second hand for the second 15 seconds.