
Grab a resistance band, form a loop in its center, and anchor it by shutting the door on it. Be sure to secure it properly.
Stand or sit with your affected side facing the door where you've secured the resistance band.
Keep the affected upper arm by your side and your elbow bent at a right angle.
Grasp one end of the band in the hand of your affected arm.
Standing nice and tall, gently move your forearm in towards your body until it's close to your tummy.
Then, slowly move it outward back to the starting position.
Repeat 8 to 12 times. Try to complete at least 3 sets initially and gradually work yourself up.