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How has the Game Changed

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by Jack Groppel, Ph.D.
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Modern tennis has changed the game of tennis significantly compared […]

Discuss Ball Control

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by Jack Groppel, Ph.D.
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In developing a player’s ability to control the ball, a […]

Improve Tracking Skills

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by Jack Groppel, Ph.D.
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Master Professional Jack Groppel discusses in this interview clip how […]

Define Racquet Skills

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by Jack Groppel, Ph.D.
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Jack Groppel, Ph.D., provides his definition of racquet skills and […]

Define Tracking Skills

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by Jack Groppel, Ph.D.
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In this interview clip, Jack Groppel defines the technical subcomponent […]

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

Define Nutrition

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by Jack Groppel, Ph.D.
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Jack Groppel offers his definition on nutrition and how it […]

Improve Strength

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by Jack Groppel, Ph.D.
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Various examples on how a player can improve strength are […]