An exceptional athlete. A dominating force. An extraordinary person. Kilian Jornet has conquered some of the toughest physical tests on the planet. He has run up and down Mt. Kilimanjaro faster than any other human being, and struck down world records in every challenge that has been proposed, all before the age of 25. Redefining what is possible, Jornet continually pushes the limits of human ability, astonishing fans with his near-superhuman fitness and ability.

Jornet adores the mountains with the same ferocity with which he runs them. In RUN OR DIE he shares that passion, inviting readers into a fascinating world rich with the beauty of rugged trails and mountain vistas, the pulse-pounding drama of racing, and a fierce love for sport and the landscapes through which he runs. In turns inspiring, insightful, candid, and deeply personal, this is a book written from the heart of the world's greatest endurance runner, for whom life presents one simple choice: Run. Or die.

Kilian Jornet Burgada is a world champion ultrarunner and ski mountaineer. The 25-year-old Spaniard was born and raised in the Catalan Pyrenees, and trains in Chamonix, France, when he is not racing around the globe.