The Ineos 1:59 Challenge was a successful 2019 attempt by Kenyan athlete Eliud Kipchoge to break the two-hour mark for running the marathon distance. The event was specifically created for Kipchoge and held in Vienna, Austria, on 12 October 2019. Due to rotating pacemakers, delivery of hydration by bicycle, and the lack of open competition, the achievement was not eligible to be ratified as a marathon world record, and is not recognized as such by World Athletics.