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NOVA | Marathon Challenge | Preview | PBS

See the full episode at http://video.pbs.org/video/1050815967What does it take for the average person to run one of the world's toughest road races? Find out with NOVA's "Marathon Challenge," a one-hour special that's both a human story and an intriguing scientific exploration of the way our bodies respond to intense exercise demands. For more information, visit http://www.pbs.org/wgbh/nova/marathon/
Length: 02:54

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