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Stand behind the chair with your left hand on the back, right hand behind your head. Shift your weight into your left leg, tap your right leg out to the side, keeping heel lifted, and lean your torso towards the chair. Bend and lift your right knee up (knee faces forward as you lift) and do a side crunch by pressing your right shoulder down towards your right hip. Hold for 1 count and then return to start. Do 20 reps on the right, then switch sides and repeat.
Form tip: Keep your hand light on the back of the chair for balance only (don’t lean on it!) and keep your elbow open to the side on the crunch to avoid pulling on your neck.
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