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Kneel behind a stability ball and position your chest on the top with your hips supported. Extend your arms in front of you, elbows straight, thumbs up. Simultaneously lift your arms as high as you can into a Y, then lower to the start. Then lift them straight out to the sides in a T, then back to the start. Finally lift them behind you in an I then return to the start. Play with the thumb position and see how it changes the emphasis — thumbs up, thumbs to the side, thumbs down.