A step ahead? Nike’s Vaporfly shoe is changing the marathon game

Marathon runner Eliud Kipchoge, wearing Nike AlphaFly prototype running shoe, and his pacemaking team, wearing pink Nike Vaporfly shoes, run during the INEOS 1:59 Challenge attempt to run a sub two-hour marathon in Vienna, Austria, on Oct. 12, 2019. (Ronald Zak/AP)

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