Quote Originally Posted by Scrap View Post
Also it protects the shoulder joint from strain, as it tightens the Tendons for the movement. Give you a clue, which way would your Hands be while pushing a car from behind, to protect the Elbow joint
That makes good sense. It's what I've wondered about. I didn't think that the tendons of the shoulder would be affected.

Anyway, one of the arguments for throwing a punch with the thumb pointed up is that the elbow isn't inclined to go out to the side when jabbing (no winging jabs). I found that this isn't a problem for turning the fist over when punching, so long as the elbow is not brought up too soon. Your example on jabbing next too a wall makes this point clear.