After you look at this video David, your serve will never be the same. Things to notice on your technique:
The left arm is tossing the ball perpendicular to the net and therefore there is no arc from the right to the left and there is no arc from the back fence to the net. Check my article about the secrets of the toss http://andrevazpinto.blogspot.com/2010/06/secrets-of-ball-toss.html
When you make contact your feet are already coming down, as a consequence there is no leg drive and no "kick of the mule" common to all pros(watch the picture below).
Roddick's "kick of the mule"
The technique you use resembles a volleyball serve. A contact a lot in front of the head, with no much shoulder rotation, with the feet and body already coming down at the time of contact, and shoulders and hips parallel to the net at the time of contact, and with no "kick of the mule" during the followthrough and finish position are all technical elements for the jump serve in volleyball!! interesting hey?
Have you played volleyball before David???
Very interesting!
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