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Old 07-19-2013, 07:28 AM   #47
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
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Quote:
Originally Posted by boramiNYC View Post
......................practice serving with minimally bent knees like wawrinka or even less. .......................
For reference, here are two videos of Wawrinka serves.

1) 89 MPH serve - https://vimeo.com/70628452

2) 130 MPH serve - https://vimeo.com/70628451

On these two serves, his knees appear to be bent roughly 70. (less bend than a 90 knee bend where 0 is a straight leg.)

Last edited by Chas Tennis : 07-19-2013 at 08:12 AM.
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