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Stability Ball Hand Opposite Knee 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 top of the ball. With your elbows wide and chin off the chest, crunch as you move the right hand to left knee. Before lowering the shoulders to the ball, crunch as you move the left hand to right knee. Without pausing in the middle, one repetition is when both the right and left hand reach the left and right knee, respectively. Do not lower the shoulders until your set is complete. Focus on proper breathing and do not hold your breath. Keep your neck relaxed and be sure to crunch with the abs and not just move then hands.