Cable External Shoulder Rotation

The shoulder is made up of three parts: the anterior deltoid, lateral deltoid, and posterior deltoid. In addition to these major muscles, there are four more to keep in mind. These are the rotator cuff muscles. Think of them as the support columns beneath a building. The stronger the columns, the better the building can handle an earthquake. The same idea applies to the shoulder. When the muscles that support it are stronger, the shoulder is stronger too. In sports, one reason for shoulder pain and shoulder injuries is placing too much load on the shoulder muscles without first strengthening these supporting muscles.