Following Khalid Khannouchi's victory in April's London Marathon, in which he broke the men's world record, there was renewed speculation that male athletes would eventually trim five minutes off the record and complete the course of 26.2 miles inside two hours. The experts promptly declared it exceedingly unlikely, if only because it would mean running four consecutive sets of 10 kilometres in times that individually would be beyond all but the best of today's athletes. So it's a tall order―but impossible?
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