This exercise is great to increase the mobility of the posterior shoulder capsule and deltoid muscle after injuring your rotator cuff & having scar tissue in the posterior shoulder capsule. Begin by lying on your back with your knees bent. Bring your arm up and across your chest and lean your weight onto the scapula of the same side. With your other hand pull the arm above the elbow across the chest. Hold this for 30 seconds doing 3 sets twice per day.