Hi guys, quick question. I strain my rotator cuff from time to time, and recently i realise its only on my kick serves. I thought about this and watched a few replays of pro serves and realised that it might have been caused by my attempts to follow through in a manner i thought was "correct". Am I right to say that the reason the follow through for a kick serve LOOKS at the side of your body is because your shoulders are less parallel to the net than on a flat serve? i.e. for a flat serve, you contact the ball with your shoulders parallel to the net, with a kick serve, your shoulders are like, say, 45 degrees to the net when you contact the ball. Your follow through is still FORWARDS, but because of the angle of your shoulders, it looks to the side? I say this because all this while I thought my arm was supposed to come down sideways, parallel to my shoulders rather than ~90degrees.