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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. The post ETI 047 | Will Staying Sideways help you hit up on the serve! appeared first on Jim McLennan's Essential Tennis Instruction.