A backyard-format endurance event held in Suffolk, using a fixed loop of 4.167 miles (6.7 km) completed on the hour every hour until only one runner remains. Terrain typically consists of mixed trail, grass and rural paths with modest elevation repeated each lap. Participants return to a central base area between laps where aid and personal support are available. The race operates under standard backyard ultra rules, with venue logistics set by the organiser.