Updated: August 26, 2011

"Lifting your opposite arm and leg at the same time forces your core, back, legs--you name it--to contract to help you stay balanced," says trainer Greg Sims, who created this exercise for his Cardio Stack, Core Attack class at Peak Fitness gym in Raleigh, North Carolina. To help maintain your form, keep your chest raised and contract your glutes before you lift your leg.

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