There is little left for Kilian Jornet to accomplish as an ultrarunner. He has won the most prestigious and grueling trail and mountain races in the world multiple times, including the Hardrock 100 four times and the Ultra-Trail du Mont-Blanc three times.

Axel Arigato Clean 90 lace-up sneakers Nike Zoom Air Fire Dark Teal Marathon Running Shoes Sneakers CW3876-300 Puma Smash Platform L Sneakers Shoes 366487-19, running shoes dont last as long, is out now. The film goes behind-the-scenes as Jornet worked toward setting the fastest known times for ascent and descent on the world’s most famous peaks.

He recently spoke to Runner’s World about why he took on such a feat, where he finds his limits, and why he feels uncomfortable in cities.

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Derek Call
Video Producer

Since becoming a video producer for Runner’s World in 2014, Derek has captured such historic moments as Meb Keflezighi and Desiree Linden’s Boston victories and Amy Cragg’s win at the 2016 U.S. Olympic Marathon Trials, and Galen Rupp and Shalane Flanagan Lottie Glitzy Sandal Sandales.