Kipchoge Takes on Boston Marathon's Toughest Challenge.
Eliud Kipchoge, the world's fastest marathon runner, will attempt to conquer the historic and hilly Boston Marathon, a course that has humbled many legends in the past. Kipchoge, who has won 17 out of 19 races and holds the world record for the fastest marathon time, has not trained differently for this race and is feeling nervous about the unique challenges of the course. Experts suggest that Kipchoge should wait until Heartbreak Hill to make his move and pay close attention to the wind when deciding whether to break the course record.