Is there a running-related sport that doesn't care about who gets there first, but instead measures success like a gauntlet, where the last person to drop out of the race for just not being able to run anymore, wins?
Not quite like a multi-day ultramarathon, where the running is segmented. I'm talking more about something that measures who can muster the longest single-segment run, with most people being expected and encouraged by their trainers to drop out once their muscles start to fail them, lest they incur permanent damage.
I imagine light weight would serve no advantage in this kind of "race."