Bend your left elbow and place it in the center of the chair seat, directly below your shoulder, hand in a fist. Walk your legs out, stacking your shoulders, hips, and feet, until you are in a side plank position with your right hand behind your head. Rotate your right shoulder down to the chair seat and try to tap your right elbow to your left fist (your hips should remain stationary as you twist). Slowly open back up to your plank. Repeat 10 times on both sides.
Form tip: Be sure to maintain a straight line from your heels to your head in your side plank position. If your chair has a very hard seat, you may want to place a towel or pillow under your forearm for more comfort.
