HOW: Get a mini-loop band set-up around your wrists or hold a theraband in your hands about shoulder width apart while keeping tension in the band. While standing and keeping your elbows straight and the rest of your body still, begin to lift your arms up overhead while simultaneously oscillating your hands out-and-in. Go through your full range of motion overhead and lower back down to starting position. Repeat.
FEEL: You should feel the muscles on the outside of your shoulders and shoulder blade muscles working very hard with this exercise. It is ok to feel a deep muscle burn as your muscles begin to fatigue.
COMPENSATION: Do not shrug your shoulders, do not lean or arch backwards, do not bend your elbows. It is important to keep your shoulders and shoulder blades strong and in position throughout this exercise.