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2 PLAYER SWINGBALL GAME ROTOR SPIN SET TENNIS SWING KIDS BALL GARDEN OUTDOOR FUN 5060497642768 | eBay
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Tried SwingVision to record a few of my serves, but it only tracked about half. Pretty cool app though : r/10s
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Tracking tennis swing with Apple Watch (Series 4) and the updated Swing App - Analytics, Digital and Sports
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