Yohann Diniz, the world record holder in the event, was leading the field in the 45th minute when a camera picked up on him beginning to struggle.
An hour or so later he collapsed to the floor, lying there motionless for a few seconds before dragging himself to his feet and continuing on.
French newspaper L’Equipe reports Diniz, 38, had stomach problems in the lead-up to the race but was undeterred and partook anyway.
His undeniable grit is earning the current world record holder a lot of fans.
We salute you Diniz. From a few feet away…