Take a moment to test all the directions in which you can move one of your shoulders. Along with this functionality comes some instability.
Pull one shoulder back as far as you can. Now move that arm straight up and down in front of you. Easy. Next, rotate that shoulder forward, extending your scapula outboard in back. This motion is now difficult. You have just simulated a condition called “frozen shoulder.” With it comes tendon inflammation and a high risk of severe tissue damage, such as detached tendons.
Sit at your computer the way you normally do. How are your shoulders positioned? If you are like 99.9% of other people sitting at a computer, your shoulders are rotated forward.
Over time, the tendons elongate from being stretched in this position and you develop frozen shoulder. Recovery can take years of physical therapy. To avoid this, set aside a few weekly sessions of prevention. Brace your hand against a doorjamb and push the shoulder back for 15 seconds. Do this four times per shoulder.