Scientists can forecast marathon performance fairly accurately. But for longer distances, things get complicated.
Maggie Guterl became the first woman to win the Big Dog Backyard Ultra, the race with no end
Dave Mackey was the first person to run the Leadville Trail 100 Run with a prosthetic leg
After switching from marathons to ultras six years ago, Boulet continues to blow away the competition
Did your favorite make the list?
By offering minimal prize money, the sport’s most prestigious race might be excluding the best runners
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