The shoulder is a relatively small joint, considering it's range of motion and the number of muscles which attach to it. Its small size and the number of arm, neck, and rotator cuff muscles jostling for space makes mechanical shoulder injuries almost a matter of inevitability.
To prevent anterior shoulder injuries, you have to make more room and to do that you have to strengthen the posterior (back) muscles and lengthen the anterior (front) muscles
How to strengthen the posterior shoulder:
The muscles of the posterior shoulder perform an action called 'retraction'. You can replicate it a the gym with rowing exercises (seated row, bent-over row, etc.) or pull-down exercises (lat pull-down, chin-ups, etc.) Watch this video to see how you can strengthen the posterior shoulder at home.
How to lengthen the anterior shoulder:
Lengthening is about stretching, specifically, a varied program of stretching. There is active, passive, static, and dynamic stretching and a combination is the best way to open up the chest and lengthen the pectorals. Check out this video on active and passive stretching that you can apply to your daily routine.
For more information on shoulder pain, email me directly via the contact page. For specific information on an injury you have, or for treatment, contact one of my clinics directly. You can find that information here.
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Dr Mitch Clark