Start in a pushup position with your body forming a straight line from head to heels. Quickly bring your right knee toward your chest (a), then return to start; repeat with the left leg. That's one rep. Continue quickly alternating. Then return to start and alternate bringing one knee to the opposite elbow (b) for the prescribed number of reps.
Prime-Time Perk: This move works your entire core to keep you cinched in. Stress and lack of sleep can contribute to a bigger waistline. (30s)
Beginner: 10 mountain climbers, 5 cross-torso rotations
Intermediate: 16 mountain climbers, 8 cross-torso rotations
Advanced: 20 mountain climbers, 10 cross-torso rotations
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