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Stability Ball Side CrunchMain Muscle: Abdominals Mechanics Type: Isolation Sit on a stability ball and place your legs shoulder width apart on the floor. Walk your feet out as you roll yourself down until the lower part of your back is on the ball. Turn to the left side and position your feet until you feel stable. With your elbows wide and chin off the chest, keep the left hip on the ball as you lift the upper part of the back off the stability ball (like a floor crunch). Slowly lower the back onto the ball. Be sure to control any movement with the stability ball and keep your left hip on the ball. Focus on proper breathing and do not hold your breath. Once you complete a set, repeat the exercise using the right hip.