MOUNTAIN CLIMBER

Works: glutes, quads, hamstrings, calves, core, chest

Stand with feet hip-width apart, arms extended at chest level, hands clasped. Take giant step to left, rotating upper body toward left. Bend left knee and lower hips, keeping left knee over foot, as shown. Press into left foot to return to starting position and repeat. Do a full minute, then switch sides.

Why It Works

This move forces you to balance and coordinate your upper and lower body while moving side to side. "It's a great exercise for strengthening muscles that often go underused in daily life

Push-Up
A. Place hands on floor beneath shoulders and balance on toes, feet hip-width apart. Bend elbows out to sides and lower body almost to floor, as shown. Keep abs tight and body in straight line from head to ankles.

B. Rest knees on floor, keeping toes tucked, and push back up, as shown. At the top of the movement, straighten legs and repeat.

Works: chest, shoulders, triceps, core

Why It Works

This hybrid of the standard push-up and the less-demanding knees-down version allows you to quickly build upper-body strength, for a flattering figure.