Stand up straight with your arm relaxed by your side.
Hold the top of a stick in the hand of your affected arm.
Hold the main body of the stick in your other hand.
Lengthen your neck and relax your shoulder blades back.
Move your affected arm diagonally forwards and up using the strength of your other arm.
Your other arm should do this my pushing the force through the stick.
Ensure you do not hunch your shoulder, or lean your body as you raise your arm higher.
Keep your neck long.
Control the movement as you lower your arm back to the starting position.
Repeat the movement.
Keep your affected arm as relaxed as possible throughout.