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Two Hours (2015) is a book about the world of international professional running. It provides background information on the sport and discusses why Kenya produces so many excellent marathon runners, with an emphasis on Geoffrey Mutai, an athlete famed for a streak of record-breaking triumphs and his revolutionary running technique.

Ed Caesar is a writer of nonfiction whose work has appeared in publications such as the New York Times and the Smithsonian. His debut book is Two Hours.

• Athletes and marathon runners
• Physiologists
• Those interested in learning more about professional running