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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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Anatomy tells us that muscles are two-way mechanisms; that is, a given muscle is either relaxed or contracted. It can’t be partially contracted any more than a light switch can be partially off.
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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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