Challenging the Comfort Zone Unknown Author Nolan Kombol is a course designer and director of innovation for Tough Mudder, a 10- to 12-mile, military-style obstacle course. February 15, 2015 at 12:00AM http://nyti.ms/1EsIlDB http://nyti.ms/1Ao4oOr The New York Times Job Market Obstacle Courses (Sport)

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