Starting in 2003, the Ultra-Trail du Mont-Blanc (UTMB) has been recognized as one of the largest ultra-marathon races in the world. Since its inception, nobody has run its full length faster than Kilian Jornet did on Aug 26-27th, 2022. With a time of 19:49:30, Kilian not only set a new record, but also established himself as the second male to win UTMB four times (matching Francois D’Haene). With performances such as this, the mind starts to wonder… What does it take to perform at this level? How fast are the best in the world running up steep gradients? What is their training like leading into these events. Below is a full summary of Kilian’s training and UTMB race data collected via his COROS APEX Proand displayed on the COROS Training Hub.