Marathon runner Eliud Kipchoge from Kenya celebrates under the clock after crossing the finish line of the INEOS 1:59 Challenge after 1:59:40 in Vienna, Austria, Saturday, Oct. 12, 2019. He is the first human ever to run a marathon under two hours. (AP Photo/Ronald Zak)
Eliud Kipchoge runs on his way to break the historic two hour barrier for a marathon in Vienna, Saturday, Oct. 12, 2019. Eliud Kipchoge has become the first athlete to run a marathon in less than two hours, although it will not count as a world record. The Olympic champion and world record holder from Kenya clocked 1 hour, 59 minutes and 40 seconds Saturday at the INEOS 1:59 Challenge, an event set up for the attempt. (Jed Leicester/The INEOS 1:59 Challenge via AP)
Eliud Kipchoge celebrates with the Kenyan flag after breaking the historic two hour barrier for a marathon in Vienna, Saturday, Oct. 12, 2019. Eliud Kipchoge has become the first athlete to run a marathon in less than two hours, although it will not count as a world record. The Olympic champion and world record holder from Kenya clocked 1 hour, 59 minutes and 40 seconds Saturday at the INEOS 1:59 Challenge, an event set up for the attempt. (Jed Leicester/The INEOS 1:59 Challenge via AP)
Marathon runner Eliud Kipchoge from Kenya, white vest, and his first pacemaking team leave the start line on Reichsbrucke during the INEOS 1:59 Challenge attempt to run a sub two-hour marathon in Vienna, Austria, Saturday, Oct. 12, 2019. (AP Photo/Ronald Zak)
Marathon runner Eliud Kipchoge from Kenya, white vest, and his first pacemaking team run on the Reichsbrucke during the INEOS 1:59 Challenge attempt to run a sub two-hour marathon in Vienna, Austria, Saturday, Oct. 12, 2019. (AP Photo/Ronald Zak)
In this photo made available by The INEOS 1:59 Challenge on Saturday, Oct. 12, 2019, Eliud Kipchoge, white vest, runs past the Lusthaus with his pacemaking team in Vienna, Austria. Saturday, Oct. 12, 2019, during his attempt to run a sub two-hour marathon.(Andrew Baker /The INEOS 1:59 Challenge via AP)
Kenyans celebrate Eliud Kipchoge's sub-2 hour marathon time, outside the Kenya International Conference Center in downtown Nairobi, Kenya Saturday, Oct. 12, 2019. Eliud Kipchoge has become the first athlete to run a marathon in less than two hours, at an event set up for the attempt in Austria, although it will not count as a world record. (AP Photo/John Muchucha)
Thousands of Kenyans come out into the streets to celebrate Eliud Kipchoge's sub-2 hour marathon time, in the Rift Valley town of Eldoret where he lives and trains, in Kenya Saturday, Oct. 12, 2019. Eliud Kipchoge sent shockwaves through the world of sport by becoming the first athlete to break the two-hour barrier for a marathon, at an event set up for the attempt in Austria, although it will not count as a world record. (AP Photo)