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Ring training and suspension trainers seem to be everywhere. You'd be hard-pressed to walk through a gym without seeing some version of this equipment. Although they are typically used for strength training, rings are also a great tool to improve shoulder mobility.

Thanks to its ball-and-socket structure, the shoulder joint is incredibly mobile. At the expense of this mobility comes stability. The shoulder relies primarily on its surrounding muscles to keep it stable in combination with the glenohumeral capsule, labrum and ligaments. So strengthening these muscles, which include the four rotator cuff muscles, is imperative.