I'm going to start with the warnings for the simple  Concerned patriot  reason that I don't wish to cause damage to anybody. I found that it was very easy for over exuberant students to hurt the shoulder when developing power in their punches. This destruction of the rotator cuff and associated elements by looking to classical martial arts.When somebody throws a punch and lets the arm bang against the confines of proper shoulder construction the tendons and ligaments finally give way. If you practice holding the shoulder back, however, as in classical karate, the structure remains intact and is not damaged. I recommend that you search for classical movements which do not hurt the body, but which utilize the whole body (turning the whole body into the motion).



http://wedidreviewforyou.com/concerned-patriot-review/