A Lie with your middle and upper back placed firmly on a Swiss ball. Raise your hips so that your body forms a straight line from your knees to your shoulders. Hold your arms straight out in front of your chest with your palms together.
B Brace your core and roll your upper body to the right as far as you can.
C Without dropping your hips, reverse your movement and roll all the way back to the left as far as you can. That's one rep.
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