Sorry, there is nothing sexy about your rotator cuff... BUT its health is absolutely vital in maximising the performance of your more aesthetically pleasing muscles. It is composed of 4 muscles around your shoulder. As a whole they compress your humerus into the shoulder socket. They also abduct your arm, internally and externally rotate your humerus at the shoulder joint. Lower your risk of injury by warming up your rotator cuff muscles. The exercises above are a good place to start. Muscles, At Home Workouts, Workouts, Baseball, Fitness, Shoulder Joint, Rotator Cuff, Upper Arm Bone, Upper Arms