The Pronator: Wrist Radial and Ulnar Deviation

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The Pronator is designed to increase your grip strength and in this video you can see how it will develop your wrist ulnar and radial deviators.
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Please post your feedback.  What do you think of The Pronator, the videos or what you ate for lunch today!

JOROInnovationsLLC
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Can you explain and demo how this would be applied to training ulnar and radial deviation as part of the modern tennis forehand stroke.

poida