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The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance, by W. Timothy Gallwey

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When more than necessary are used, not only is there a waste of energy, but certain tightened muscles interfere with the need of other muscles to relax.
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The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance
The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance
by W. Timothy Gallwey
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