The Arms and Shoulders are both part of the Machine's Power Package. So we want these parts of our body strong but mobile and flexible as well. Specifically both your Triceps for firing and extending the arms through impact. And the Lead Shoulder/Deltoid Muscle which is the Fulcrum Point of the Swinging Lever and Support for Impact! Let me show how to effectively and safely strengthen the muscles so your swing with have all the support it needs to deliver the most power and speed at Impact!