The Barkley Marathon: one of the world's toughest races. 5 loops, 120 miles in 60 hours. Only 20 people have ever finished since 1995. No phones, just a map & compass. Find 13 hidden book pages to escape. #BarkleyMarathon #UltraRunning #Endurance #RaceDay #Adventure #TrailRunning #ToughRace #Motivation #ChallengeAccepted