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Define Flexibility

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by Jack Groppel, Ph.D.
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Jack Groppel, a USPTA Master Professional defines flexibility as the […]

Improved Flexibility

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by Jack Groppel, Ph.D.
Video

As a player trains to improve his flexibility, there are […]

Define Nutrition

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by Jack Groppel, Ph.D.
Video

Jack Groppel offers his definition on nutrition and how it […]

Improve Strength

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by Jack Groppel, Ph.D.
Video

Various examples on how a player can improve strength are […]

Define Strength

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mediatype: Video
by Jack Groppel, Ph.D.
Video

USPTA Master Professional Jack Groppel defines strength and explains the […]