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Serve: Swing Out & Up for Power | FROM BACK SCRATCH RACKET SWINGS OUT & UP; SUPINATE FOREARM IN "SWING OUT" FOR MORE ROTATIONAL POWER WHEN PRONATING INTO IMPACT | image tagged in gifs,tennis,tennislesson,tennisserve | made w/ Imgflip video-to-gif maker
youtube video source: youtu.be/x4G2JpcTZ-k