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Stability Ball 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. With your elbows wide and chin off the chest, lift the upper part of your back off the stability ball (like a floor crunch). Slowly lower yourself back onto the ball. Be sure to control any movement with the stability ball. Focus on proper breathing and do not hold your breath.