Ultra Trail Runner François d’Haene attempts the FKT for the GR20, one of the more gnarly European trails.
Only four runners had gone sub 40 hours, Kilian Jornet did it in 32h54m in 2009, and current record holder is Guillaume Peretti who did it in 32 hours flat.
Check:
https://www.redbull.tv/video/AP-1PSA9HBC11W11/crossing-corsica?playlist=AP-1PSA9HBC11W11

