I've been working a lot this year, thanks to the incomparable Marcia Robles, on shoulders. Shoulders are like the Regina George of joints: they're fabulous but they're evil. Meaning they are (or should be) one of our most mobile joints, but due to modern living and desk culture many folks suffer from lack of proper shoulder mobility/stability, impingement and other dysfunctions which make it hard or impossible to strength train. But with the proper warm up and mobility drills, and the clearance of your physical therapist if you have one, this program is a great one for getting those striations popping and to stimulate hypertrophy (muscle growth).