Sit in an upright position holding a resistance band.
Rest your symptomatic arm out to the side on a table or solid work surface.
Your arm should be at approximately 90° to your body.
Bend your elbow to a right angle, and hold the resistance band in your affected hand.
Hold onto the other end of the band with your good hand and maintain some tension in the band.
Maintaining good posture and shoulder blade control, rotate your affected arm up and down so that your forearm moves off the table from horizontal to vertical.
Your elbow should remain at a right angle and your posture should stay straight with your shoulder blades remaining back and down.