Born and raised in the heart of the Pyrenees, Kilian Jornet is the GOAT of mountain running and skimo, and he’s an accomplished climber too. This past summer, Jornet used his extraordinary fitness and deep reservoir of mountain skills and savvy to tackle one of the greatest challenges of the Alps: a traverse of all 82 of the range’s 4,000-meter peaks, solely by foot and bike. The fastest previous time for this link-up was 60 days. Jornet did it in 19.

Cutting Edge host Jim Aikman interviewed Kilian Jornet about his “Alpine Connections” project—the preparation, the physiological and psychological challenges, and the real dangers of covering hundreds of kilometers of serious alpine terrain at speed, often alone. For context on the history of grand Alpine enchainments and commentary on Jornet’s latest feat, Jim spoke with Colin Haley, elite climber and Chamonix resident; Buzz Burrell, one of the originators of the Fastest Known Time (FKT) movement; and Dougald MacDonald, editor of the American Alpine Journal.

Is it mountaineering? Is it running? Whatever you think of a feat like this, it’s undeniably at the cutting edge.