Stotty,
There is no such thing as pronation on the serve. Pronation is the rotation of the forearm from the elbow. The rotation you are thinking of his the rotation of the upper arm in the shoulder. That's from the drop to the extension as shown in this article. Calling it pronation is ok as a teaching term. Brian Gordon found though that it simply didn't exist in the serve.
There is no such thing as pronation on the serve. Pronation is the rotation of the forearm from the elbow. The rotation you are thinking of his the rotation of the upper arm in the shoulder. That's from the drop to the extension as shown in this article. Calling it pronation is ok as a teaching term. Brian Gordon found though that it simply didn't exist in the serve.
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