Golf is a game that is dependent on being pain-free and being in good shape. The shoulders have to turn and come through the ball on every shot, so if there is pain, discomfort or an injury, you won't be able to come through the ball and playing the game will be a burden. The shoulder is supported by four small muscles that make up the rotator cuff. They are on the delicate side and they have to be kept in good shape in order to operate without pain. The physio ball is a tool that can help you rehab from an injury and get back on the course. However, when you start these exercises you will need the direction of a licensed physical therapist.