File photo taken on Oct. 12, 2019 shows Kenya's Eliud Kipchoge crossing the line during the competition of "1:59 challenge" in Vienna, Austria. On October 12, marathon world record holder Eliud Kipchoge of Kenya became the first person to run the 42.2km marathon distance in under two hours, doing so in Vienna in one hour 59 minutes 40 seconds. However, his time was not considered an official marathon world record owing to the use of pacemakers and the lack of open competition. (Xinhua/Guo Chen)