The text profiles Kílian Jornet, the most famous trail runner, delving into his life, extraordinary achievements, and philosophy. It examines his complex relationship with fame and his pursuit of human limits, reflected in works like Run or Die, which reveal his poetic and introspective view of nature and pain. Beyond athletic performance, his deeper motivations are explored, highlighting his quest for a broader meaning in sport. His ambivalence, balancing success and a desire for solitude, makes him a compelling and controversial figure.