@5263
What does this mean? Misworded?
".......
The earlier you start ISR/pronation, the less power and spin that will get delivered to the contact."
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I use the term "edge on" to the ball because it is a useful checkpoint for the high level serve. The position to use this checkpoint is the Big L. The picture in post #27 shows the racket about 'edge-on" to the ball at the lower red arrow.
The edge-on checkpoint is on the far right. Nalbandian's upper arm - between his shoulder joint and elbow - will spin like a top, that is, do ISR. I have often shown this when I used the term
edge-on to define my usage.
http://www.hi-techtennis.com/serve/big_l_student.php
Almost always when a racket is traveling toward the ball, even often at impact for the serve, one edge will be ahead of the other. Therefore saying 'leading with the edge' does not say much.
In the late 80's, I must have heard about pronation (before ISR was understood) and was experimenting by swinging at the ball and at the last second, about 6-10" before impact rotating the racket face using forearm pronation. So I see how the word descriptions can be misleading from first hand experience. After 35 years of following oversimplified word instructions and descriptions of the serve, I'd like to junk the word descriptions of motions and replace them with high speed videos plus words.
I have looked at a lot of poster's serves. Some literally rotate the racket face a very short distance before impact, much like I did in the 80s, but using ISR or ISR & pronation or pronation. Other posters, especially for the slice or kick serves, lead with one edge, fixed angle, and go at the ball to impact with it; there is little ISR. I believe some of them have been misled by simple but ambiguous word descriptions. Now I advise everybody to use high speed videos as their most accurate information, plus some words to point out what is in the videos.
Many posts are arguments about what undefined terms like
edge on mean to two different people. Basically describing a complex 3D athletic motion with poorly defined words is unworkable and can mislead people.