as much as you can — keep your shoulders on a straight line and your shoulders over your hips– a tall back
more L3
mid court waiting go in go back based on the return going to or away from the net player
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core balance
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both back
on the return both back to work on just getting the return back
coil
on the serve start coil the body
non hitting hand
keep the non hitting hand on the racquet during the rotation