Originally Posted by
Oso
with all due respect to everyone: i don't care what you say, if you strike with a fully extended arm and your elbow is is rotated any more than 90 degrees (ie,pointing upwards vs. to the side or downward, also indicated by the thumb pointing downward as contact is made with the fist or the hand) you shoulder is 'open' (sorry, i don't have TGY's terminology). 'open' as in the ball of the upper arm bone is not seated in/against the socket and the stresses are then carried soley on the soft tissues of the rotator cuff. long term, you will end up with tears.
all you have to do to test this is put your opposite hand on top of your shoulder and lift your elbow. you can feel what happens.