The Nightmare Challenge is the home of Mean Green – Ohio’s toughest obstacle! The 5K mud and trail run takes you through the dense woods and along a creek bed before going straight up the cliff to even more tough obstacles. This event has lots of mud and mud pits including over 20 tough obstacles such as a 15 foot rock wall, 100 yard swim (non-swimmers route with no penalty), 15 foot cargo net, rope ladders, ice pit & lots of natural hills.