We've heard from people doing the incredible high routes, going non-stop often above timberline for days - now let's hear from one of the fastest FKT runners out there!
"The pinnacle is the World Mountain Running Championships. It is the fastest, most extreme, version of trail running. The speed and shortness makes you take chances you never would otherwise. One tiny mistake and five people pass you."
Andy has been on 14 US National Teams, so has terrific experience and perspective: