13. Doorway Stretch
This amazing stretch will open up the chest to prevent slouching, which in turn will prevent neck and shoulder strain.
You should stand inside a doorway with the right arm bent at 90-degree angle. The forearms should be placed against the doorframe. Place the bent elbow at shoulder height.
Another alternative is to grab the doorframe with your hand. You can see in the picture above. Rotate your chest to the left and do this until you feel a stretch in the front shoulder and chest. Hold for 20 seconds then repeat with the other arm.
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