The shoulder is the most mobile joint in the body, so it's not surprising that it's one of the most commonly jacked-up joints as well. Nearly everyone I have worked with has messed up their shoulder at one time or another (including me). It's easy to do once you know how, thankfully, it's also relatively easy to fix.
To know what exactly we have to do, we have to understand how the shoulder works. The humerus bone (upper arm) is the ball of the ball-and-socket joint, and it sits in the glenoid cavity of the scapula, which, you've guessed, is the socket—a shallow socket at that.
Cuban rotations strengthen all four rotator cuffs, and rotator cuffs are one of the main culprits in a shoulder injury.
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