Typically for a baseball player and a softball player or swimmer, a repetitive overhead motion to create pain in the front in order to prevent that. Simply find the wall. Set yourself up at 90 degrees against the wall. It went shorter at 90 degrees. Take your cheek, one to your shoulder, grab your left hand, and as you hold that shoulder in place with your cheek, bring that right hand then. and you should feel a good stretch in the back of your shoulder. And if you're lefty, just flip the sides. Hold that hips.