After six months of scientifically advanced training, three of the world's most elite distance runners set out to break the two-hour marathon barrier. These pioneers go on a global trek to defy the unthinkable and break the two-hour feat, from testing in wind tunnels and running labs in the United States, to balancing training with their day-to- day lives in eastern Africa, to the final heart-pounding race in Italy.

• DirectorMartin Desmond Roe
• Release20 September 2017
• GenreDocumentary
• Duration0h 55m
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  8.5
  10 reviews
• Productions

  National Geographic