While watching a Bernard Tomic Slow Motion Serve Video I noticed that his Trophy Position is not really textbook-form. The elbox of his hitting arm is a lot higher than what you usually see with the other pros. Yet his first serves still clock in at over 100 MPH, usually peaking at almost 130 MPH. I was wondering where he gets his power from? I'm asking because I have the same issue with that high elbow and I've been struggling to fix it. How important is it to have a steep shoulder angle in the trophy position?