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The little-known book that shaped the minds of Steve Kerr and Pete Carroll

SI senior writer Chris Ballard explains how Golden State Warriors head coach Steve Kerr uses 'The Inner Game of Tennis' to get the most out of his players.

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The book’s not much to look at.

Roughly the size of a Reader’s Digest. Only 134 pages long. You’ve likely never heard of the author, Timothy Gallwey, even though the title’s been in print for 40-plus years.