WATCH: Kilian Jornet Eats Mountains for Breakfast

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Kilian Jornet holds, or has held, speed records on the Matterhorn, Aconcagua, Mont Blanc and Denali. He has won the Ultra-Trail du Mont-Blanc three times, the Hardrock 100 four times and the Sierre-Zinal four times. This winter, he summited Mount Everest twice in one week without the use of supplemental oxygen.

This clip reel shows the Spanish runner at his best.

Want to Know What It Takes to Finish at Western States? Just Ask Hellah Sidibe.

Find out what happened when this six-year run streaker and HOKA Global Athlete Ambassador took on an iconic ultramarathon in California's Sierra Nevada