Chas Tennis
G.O.A.T.
I suspect that people who 'know how to throw' are using some internal shoulder rotation (ISR) in their motion. I believe that you can throw without using much ISR - including the infamous 'throws like a girl'.
I can throw with or without ISR. ISR feels a little uncomfortable since I don't think that I used enough of it when throwing in the past.
High speed video could easily show the nature of the throw and amount of ISR.
Certainly ISR is the common thread between professional baseball pitchers and professional level servers.
For now, I believe that if you train by throwing and your throw has no ISR it could help smoothness but train different muscle memory than is needed on the serve. People have success with throwing rackets, etc., so it must have value for many people.
I can throw with or without ISR. ISR feels a little uncomfortable since I don't think that I used enough of it when throwing in the past.
High speed video could easily show the nature of the throw and amount of ISR.
Certainly ISR is the common thread between professional baseball pitchers and professional level servers.
Maybe this relates to the throwing & tennis serve connection -
The baseball pitch and the serve both use the same motion to develop the final high baseball speed and final high racket head speed.
Baseball pitch
http://www.youtube.com/watch?v=Y2PBLcp9tWM
At 46, 58 and 1:10 you can clearly see Tim Lincecum's upper arm rotate and especially his biceps flop around violently right afterward. (2500 fps?)
Overhead view of baseball pitch. http://www.youtube.com/watch?v=p8s1KbK1eaI
Tennis Serve
https://vimeo.com/66720415
Look for the biceps of Raonic to flop around after impact in a similar manner to the Lincecum pitch.
Another
https://vimeo.com/66720474
This same motion can be clearly seen in most of the other pro serve videos.
https://vimeo.com/user6237669/videos
For now, I believe that if you train by throwing and your throw has no ISR it could help smoothness but train different muscle memory than is needed on the serve. People have success with throwing rackets, etc., so it must have value for many people.
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