Lie on your back, knees bent. Place a towel across your upper shins and grasp each end. Pull the ends of the towel and squeeze thighs together. Inhale, then exhale as you draw your abs in and lift your shoulders off the floor [shown]. Hold, and contract and release, your ab muscles 10 to 12 times, working up to 20. Do moves 1–4 in order for two weeks.
Strengthens the transverse.
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