one of the ways to pre set the loose wrist on the serve is to put the racquet face to the sky during the pull back
still level
even stretched out keep the racquet level
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racquet face to the sky
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core balance
even when jumping maintain for balance
more dipping
get the racquet dipped to the ground to increase your up swing
elbows up
on the two handed backhand follow through– get both elbows up