If so/not how should my hand be? while and after I snap my wrist.
it is important to keep it straight if not you have a high chance to sprain (or worse) your wrist.
no, you shouldn't flex for hand when hitting the ball. the only thing you should being doing with your hand itself, is try to keep is nice and flat. your wrist will be the only thing doing the snapping.
No, you should keep your arm by your ear and swing, the also have a good approach and then snap with your wrist so the ball will actually be in the court and not somewhere else!!
No keep it straight to prevent injury.
good luck
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