Why is Eliud Kipchoge's sub 2 hour marathon not in the record books?
Eliud Kipchoge has become the first athlete to run a marathon in under two hours, beating the mark by 20 seconds.
The Kenyan, 34, covered the 26.2 miles (42.2km) in one hour 59 minutes 40 seconds in the Ineos 1:59 Challenge in Vienna, Austria on Saturday.
It will not be recognised as the official marathon world record because it was not in open competition and he used a team of rotating pacemakers. Is this fair?
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