Lay face-up with the ball resting under your mid/lower back. Cross your arms over the chest or place them behind your head. Contract your abs to lift your torso off the ball, pulling the bottom of your ribcage down toward your hips. Try as best you can to keep to ball stable. You do not want it rolling away on you. This may take some practice at first. Lower back down, and repeat for 12-16 reps.
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