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.
Great shoulder exercises using Therabands - good idea for individuals (ahmmm! Football players, pitchers) needing strong rotator cuffs. My ballet dancers out there can also benefit from these exercises to get more proper alignment.