FatPlate is a visual aid that encourages golfers to accurately compress the ball.
It is a polycarbonate plate with synthetic turf on one end. There are 4 ball positions (4 being the most difficult). Simply place the ball in 1 of 4 positions and swing as normal. The goal is to strike the ball on the turf and miss the polycarbonate area.
In time muscle memory develops which allows golfers to continually hit the ball off the synthetic turf strike-zone.
Also comes in FatPlate Lite, and FatPlate Sand.
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FatPlate