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If you watch people who weight train frequently, you'll notice the palms of their hands face backward instead of facing into their hips when they are standing. This is caused by tight arm bone internal rotators (pectorals, latissimus, and rotator-cuff internal rotators), or a scapula that sits too far from the spine, or a combination of both. You can also see this by watching your arm as it reaches overhead. If your elbow turns out (the crease of your elbow faces in) early in the act of reaching, or if your back arches when you reach overhead, then tight internal rotators may be altering your arm movements.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.