Stand with feet shoulder width apart, a light band anchored in front of you, or secured under one of your feet.
Start with your elbow pointed out to the side of our body, inline with your shoulder and bent to 90 degrees. Forearm parallel to the ground.
Keeping the Elbow bent, externally rotate your shoulder, so that your forearm finishes pointed toward the sky, wrist above your elbow.
Pause at the top, and lower slowly under control repeat for repetitions.