The Nike Vaporfly seems to be a remarkable pair of trainers. Does it offer too much of a leg up?
But inspiring as it was, the master’s most recent performance will not feature in the official record books. Like Nike’s Breaking2 event, the Ineos 1:59 Challenge bent the rules of the IAAF, athletics’ governing body. The location and route were optimised to increase the likelihood of a sub-two-hour time, and a variety of start dates and times were kept open to prevent the weather from throwing a last-minute wrench in the plan.
under IAAF rules, most of that two-minute gain would vanish under even the most favourable non-exhibition circumstances.One of the biggest factors in Mr Kipchoge’s 1:59:40 display, however, is fully legal in official races. In Vienna he wore Nike’s latest advance in running-shoe technology: the Vaporfly Next. Its predecessor, the Vaporfly 4%, got its name from the shoemaker’s claim that it improves running efficiency by that margin, a staggering advance that has been.
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