Originally posted by uspta146749877
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Hewitt extends his arm at the elbow to some extent during the take back. In fact, almost all the men do it including double benders (Djokovic, Roddick, Soderling, Ferrer etc.)
I've never actually observed any videos of any of these guys "shortening" their hitting arm structures into a double bend. The only time "shortening" occurs seems to be near or after contact (however I can't tell if it's a bicep contraction, or simply part of the follow through).
So in a way I can see what CK is saying, in that a player shouldn't "shorten" the arm. However, I don't think "shortening" into a double bend is something Jeff, John or anyone else teaching the double bend have ever advocated in any of their articles.
CK if you could maybe provide a video analysis of a player performing a bad double bend it would help everyone understand what you mean.
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