Lie on your back on the floor with your legs up on top of a stability ball so that your calves are touchingthe ball. Raise your hips so that your body is straight, then curl the ball back toward you by digging your feet into the ball, bending your knees, and continuing to raise your hips. Slowly extend your legs back to the starting position, finishing by lowering your hips back to the floor. You can make this exercise more difficult by performing it with one leg.
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