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The Oncourt Offcourt Swivel Disks help players feel optimal body rotation needed to generate powerful topspin groundstrokes. Each 11" slip resistant Swivel Disk has dozens of steel ball bearings to ensure a smooth circular glide. Some coaches call the movement experienced with Swivel Disks the "figure eight" rotation. Whatever you call it, players will gain a quick feel for naturally opening the hips to gain more power from the body's core. A second benefit is increased loading of ground forces, the result of improved balance.
Includes detailed instructions outlining progressions for shadow swinging as well as hitting balls. | 
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