ETI 047|Will Staying Sideways help you hit up on the serve! - a podcast by Jim McLennan | Tennis Instructor

from 2016-08-24T03:44:46

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The common problem I see at the club, as well as on television, is where the server flexes at the waist at the hit - more or less jackknifing to create a little more ball speed.

And this action creates both forward and downward forces - and is generally associated with netted serves.