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Journalist Calum Marsh discusses his new book, 'The Glass Box'

NPR | By A Martínez

Published October 26, 2026 at 2:42 AM MDT

NPR's A Martinez speaks with journalist Calum Marsh about his new book, "The Glass Box: The Shocking True History of How CrossFit Broke the Rules, Made Millions, and Changed Fitness Forever."

A Martínez

A Martínez is one of the hosts of Morning Edition and Up First.

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