mountain and competed in his first cross-country ski race at age three. By age seven, he had scaled a 4,000er and, at ten, he did a 42-day crossing of the Pyrenees. He was 13 when he says he started to take it 'seriously' and trained with the Ski Mountaineering Technical Centre (CTEMC) in Catalonia, entering competitions and working with a coach. At 18, he took over his own ski-mountaineering and trail-running training, with a schedule that only allows a couple of weeks of rest a year. He does as many as 1,140 hours of endurance training a year, plus strength training and technical workouts as well as specific training in the week before a race. For his record-breaking ascent and descent of the Matterhorn, he prepared by climbing the mountain ten times until he knew every detail of it, even including where the sun would be shining at every part of the day. Sleeping only seven hours a night, Kilian Jornet seems almost superhuman. His resting heartbeat is extremely low at 33 beats per minute, compared with the average man's 60 per minute or an athlete's 40 per minute. He breathes more efficiently than average people too, taking in more oxygen per breath, and he has a much faster recovery time after exercise as his body quickly breaks down lactic acid – the acid in muscles that causes pain after exercise. All this is thanks to his childhood in the mountains and to genetics, but