Gradually, the grip can be lengthened and the backswing and follow-through added as confidence starts to grow.
The whole kinetic chain including the pronation of the forearm will collectively produce a smooth and effective serve. The photos below are an example of the waitress position and a correct "on-edge" cocked position.
More: How to Improve Your Second Serve
1. When the racket is flat behind your back, all of the power has to come from your wrist. | 2. This motion places tremendous stress on your wrist. |
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3. When the racket is on edge, your arm will be in the cocked position. | 4. Now the wrist pronates in a natural movement. |