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Old 10-07-2012, 05:20 AM   #6
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
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Quote:
Originally Posted by Javizzle View Post
.......................................I find that when my toss is slightly forward it helps, but i find that weird given that you like at people like Fed and they are making almost a slightly angled straight line on contact. .................................................. ..
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Racket Angle from the Video Side View. Recently I've started to look more at high speed video of serves from the side view. The pro servers that I looked at had their arms and bodies angled forward at impact. The racket axis component viewed from the side was near vertical. The servers very frequently, to my surprise, were not looking at the ball at impact, maybe to relieve stress on the neck.? Unfortunately, from the videos I usually can not determine, with any confidence, the type of serve, flat, slice, kick, etc. that they have hit.

Racket Angle from the Video Behind View. From behind the pros have an angle between the axis of their arm and the axis of the racket. This angle, β, is needed to utilize internal shoulder rotation (ISR). Search internal shoulder rotation & serve on this TW forum.

See β on the Federer serve in the #1 reply, OP, Toly.
http://tt.tennis-warehouse.com/showthread.php?t=361610

Long thread discussing ISR (ISR is widely mislabeled 'Pronation' used in forum tennis discussions.)
http://tt.tennis-warehouse.com/showt...nation+science

High speed video view from behind of internal shoulder rotation just before impact. Look at the rapid rotation of the elbow bones, that's ISR.
https://vimeo.com/27528701

The ISR technique is currently used by all current pro servers. It is relatively safe if done properly by a conditioned athlete.

Unfortunately, after your injury and operation your shoulder is an unknown factor. For ISR, the humerus does axially rotate very rapidly and forcefully at the labrum.

Suggest that you study the serve thoroughly and take high speed videos of your serve. Since your shoulder is an unknown factor be very careful in imitating the pro serves and even more so in developing your own technique.

Be sure to understand this video by Todd Ellenbecker on the shoulder and its injury risks in tennis. At minute 8 he describes shoulder orientation on serving to minimize the risk to the shoulder. He also has conditioning exercises especially for the external rotators that stop the racket and arm in the follow through - if the external shoulder rotators are weaker and if they lack endurance the injury risk goes up because the ball of the humerus is not held stably.
http://www.tennisresources.com/index...2&ATT=&reso=hi

Last edited by Chas Tennis : 10-07-2012 at 06:36 AM.
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