After we've read above, I found that the muscles in the shoulder and arm muscles to exert rather than out. If not, focus and Innsbruck, so great trainers should intend to focus, to a full chest muscles.
After reading the above, we have already found. Shoulder and arm muscles to exert the chest. If you do not focus, and squeeze a buck as well. Therefore, the training should aim to focus on the chest fully.
after we have read above, it was found that the shoulder muscles before and after the arm will exert instead of muscles. If not, focus and squeeze a buck. So the coach should pay attention to focus on the muscle out fully .