Shoulder strength and stability: hug the ball
https://www.youtube.com/watch?v=YfpNnMjEsqw
When working with patients with shoulder girdle weakness and instability, whether from an acute injury or more of a chronic postural strain, there are a couple of foundational exercises that we will use as a starting point for strength and stability recovery. Those exercises can be done safely as a starting point with little to no risk of injury when performed correctly, and can be used as a progression tool to more aggressive strength building.
The "hug the ball" (or hug the pillows) exercise allows patients to recruit the scapula stabilizing muscles and prevent some of the chronic rounded shoulder and shoulder blade winging. The ball or the pillows allow for a counter resistance that can be light or intense, and allows for a slow eccentric release. The main technique to pay attention to is making sure to engage the deep interior blade muscles to squeeze the ball and not the biceps.