Stretching is key! One thing that a lot of people forget to do is stretch and warm up. The best way to workout a muscle is to make sure that it is stretched and ready to go! Here are some great ideas for upper body stretches!
Many of these are yoga positions. Work to achieve them slowly. With time it will come. ~ Muscle assisted shoulder stretches: tricep stretch, one arm over the head, both arms over the head, cow face yoga position, grab an elbow be.