Since its creation in 2008, the KV de Fully has become the most mythical vertical kilometer in the world. Stretched between the wine-growing village of Fully in Valais (Switzerland) and Sex-Carro, it unfolds 1,920 horizontal meters for 1,000 meters of positive elevation gain, a staggering average gradient of 52%.
The bisse staircases, uneven steps cut into the rock, make this course as mythical as it is grueling. The cadence has nothing in common with classic trail running: you climb straight up, at a rhythm that forbids running but pushes quads, calves and cardio to full capacity.
The men's record fell in 2025 when Switzerland's Rémi Bonnet set a time of 27:21, redefining the limits of the discipline. On the women's side, Axelle Gachet-Mollaret claimed the record at 32:52 in the same year, making Fully the only course to have seen both world records fall within a single year.
The race runs once a year at the end of August, open to about 400 participants. Reserved for confirmed athletes, the punishing effort demands specific preparation: footwork, core strength, and high lactate tolerance.
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