This is a great stretch if you are looking to improve your backswing rotation and or the width of your backswing. Ensure that you don't move your lower body and you are feeling your upper back rotate into the stretch. Always move into a position that you can relax into and not feel any pinching or pain. Breathe for 1-2 minutes completely relaxing into the stretch and then start to create your PAILs contraction slowly (20%, 40%, 60%) and hold for 10-15 seconds. After your PAILs contraction slowly move into your RAILs contraction.