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Three of the world's top distance runners set out to break the two-hour marathon barrier after six months of scientifically advanced training. These trailblazers embark on a global journey to defy the impossible and break the two-hour mark, from testing in wind tunnels and running labs in the United States to balancing training with their daily lives in eastern Africa to the final heart-pounding race in Italy.
Released: 2017-09-20
Genre: Documentary
Duration: 55 min
Production: National Geographic

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