Have you tried strengthening your upper body with dumbbells? If you do it wrongly, you may end up with shoulder pain! Watch this video to learn how from Balance Core Physiotherapy Expert how to improve shoulder control, so that you can tone up your body safely!
The key muscles to target are: Rotator Cuff (particularly the Supraspinatus), and Serratus Anterior. These are two important muscles that stabilize the shoulder, yet many people missed them out due to improper posture and actions.