Serratus punch supine with dumbbell ("Serratus punch" Scapular protraction strengthening, with dumbbell, supine)

Lie on your back with your arms and legs straight, holding a weight in the hand of your affected side.
Move your arm up towards the ceiling, extending your elbow straight out and try to lift your shoulder blade off the floor.
Return your shoulder blade back down to the starting position in a slow and controlled movement.
Repeat the exercise.