Check out the hoppity hop drill at the bottom of this analysis of Jeff Greenwald's serve:
https://www.tennisplayer.net/articles/
And the same thing in the Paul Goldstein article:
https://www.tennisplayer.net/articles/
https://www.tennisplayer.net/articles/
And the same thing in the Paul Goldstein article:
https://www.tennisplayer.net/articles/


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