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. Dominating ultra marathons and races at altitude, he has redefined what is possible in running, astonishing competitors with his near-superhuman fitness and ability.

Inviting readers into a fascinating world rich with the beauty of rugged trails and mountain vistas, this inspiring, insightful and deeply personal book presents one simple choice: Run. Or die.