Kilian Jornet stretches out his legs. Legs feared by the competition and celebrated by mountain sport fans all over the world. They have carried him up and down from the world's peaks in record times. "I am just a mountain climber who has fun", he answers with a smile. For Kilian Jornet, having fun means: running up and back down Mont Blanc in 4:57 hours. A world record time. Crossing the Pyrenees in 8 days, covering 850 kilometres and a cumulative elevation of 42,000 meters. Climbing Mount McKinley, North America's highest mountain at 6,186 meters, on foot in the snow and fog in order to ski back down. A journey of 11:48 hours. And naturally, a record time. Kilian Jornet dominates endurance mountain sports.