Training discussion with "Lover of Mountains" Kilian Jornet

He is an undisputed endurance legend, and arguably the GOAT in all things intensely vertically challenging and long in distance. Kilian Jornet gave me an hour of his valuable time to chat about endurance training and his approach to it for the short (3-4h) and long (19-21h) events that he still dominates after many years at the top.