My take on shoulder injuries is that it has a lot to do with both weaknesses in the core and the shoulder. If you have a weakness in the core more stress will be put on the shoulder joint during the pull phase of the stroke.
The first rule is to prehab - don't wait until you have a problem to try and strengthen your shoulder and core. The second is to choose dynamic exercises that challenge the core and bring the shoulder through multiple ranges of motion while performing the exercise. Proper progression MUST be used, no pain should ever occur, and every movement shoule be controlled. Follow these guidelines and you are ahead of the game.
Here is an exercise that we use with our swimmers and MLB players. Works great but make sure you progress properly.
YouTube - Grif Fig and Adam Brush - dynamic shoulder exercise
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The guy doing the demonstration is holding a ball. Is that a weighted ball? If so, how heavy is it? Are you supposed to progress to a heavier ball as you get stronger? If so, what is the maximum weight that should ever be used?
The guy doing the demonstration is holding a ball. Is that a weighted ball? If so, how heavy is it? Are you supposed to progress to a heavier ball as you get stronger? If so, what is the maximum weight that should ever be used?