Eliud Kipchoge is banging on the door of history. At this year's Berlin Marathon the Kenyan was a little over a minute from running the first official sub-two hour marathon. For many, that's the athletics equivalent of putting a man on Mars. It would redefine what is possible. Can he actually do it? If you listen to athletics legend Dick Telford it's a matter of when, not if. Featured: Dick Telford, athletics legend/sports scientist

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