Stand up straight with one end of a resistance band placed firmly under your foot.
Hold the other end of the band in your affected hand with your palm facing forwards.
Bend your elbow to 90 degrees to assume your start position, ensuring there is moderate tension in the resistance band.
Keeping your arm by your side, slowly continue to bend your elbow, pulling against the resistance of the band. Control the movement as you lower your arm back down to the start position.
Pause, and then repeat.