13-Minute Workout to Firm Up and Melt Fat

Your trainer: Equinox group fitness manager Angela Leigh gives SELF—and you!—a sneak preview of moves from her new class, Stacked.

How It Works: Just as in Leigh's class, Stacked, you'll stack the moves on these slides for the perfect 13-minute workout. Wanna zap cals? Do the Burn stack. Feeling flabby? Focus on the Firm moves. Or do both. Either way: Start with move one; rest 30 seconds. Do move one again, then add move two; rest.

Next, do moves one, two and three; rest. See a pattern? Stack to move six and you're done. Moves get progressively harder, so the last one is supposed to be tough. But you only do that sucka once!

FIRM: Prisoner Squat
Stand with feet hip-width apart, hands behind head, elbows out. Squat; stand, crunching left elbow to left hip. Return to squat. Repeat on right. Alternate sides for 30 seconds. Works abs, obliques, butt, thighs

Check out: The Ultimate Guide to Flat Abs

FIRM: Fly Away
Start in a plank, then drop to floor, extending arms in front of you; raise limbs and head off floor. Hold for one count. Lower to floor, then press back up to plank. Repeat for 30 seconds. Works shoulders, back, abs, thighs

FIRM: On Strike
Stand with feet hip-width apart, arms at sides. Do a reverse lunge with right leg. Press through left leg to return to standing as you thrust right knee toward chest. Return to lunge. Repeat for 15 seconds. Switch sides; repeat. Works abs, hips, butt, thighs, hamstrings

More: 10-Minute Toning Workout

FIRM: Kick-Starter
Lie faceup with legs together, raised toward ceiling, feet flexed, hands behind head, elbows out, shoulders lifted. Lower left leg until it hovers above floor. Return to start. Repeat with right leg for one rep. Alternate sides for 30 seconds. Works abs

FIRM: Grab and Go
Start in tabletop: faceup, hands under shoulders, fingers forward, hips lifted with knees bent. Bend elbows to lower body toward floor, then straighten arms and grab left foot with right hand. Return to tabletop. Repeat on opposite side. Alternate sides for 30 seconds. Works shoulders, triceps, abs, butt, thighs

FIRM: Walk It Out
Start in a plank. Do a push-up. Place right hand about 12 inches in front of you, then return to start. Do a push-up. Repeat with left hand. Place right hand in front of you; bring left hand to meet it. Return right hand to start, then left. Do a push-up. Repeat for 30 seconds. Works shoulders, chest, back, abs

More: 8 Ways to Modify a Push-Up

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