The Barkley Marathons is a cult-like race that pushes participants to their limits of physical and mental endurance, with only 10 people completing it in its first 25 years.
The Barkley Marathons: The Race That Eats Its Young
A cult-like race inspired by a famous prison escape has only had 10 finishers in its 25-year history, despite being the sports world's most guarded secret.