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Duathlon challenges experienced athletes

Participants race on their bicycles during the 12-mile portion of the 14th annual duathlon at Schriever Air Force Base, Colorado, June 8, 2018. The event required athletes to complete a 1-mile run, followed by a 12-mile bike ride and finish with another 1-mile run. (U.S. Air Force photo by Kathryn Calvert)

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