from Wikipedia. The Fan Dance is part of the Fitness and Navigation phase of the selection process of the UK's Special Forces personnel. It has also been used on courses run by the Pathfinder Group and the RAF regiment II Parachute Squadron as well as the Infantry Battle School,Brecon, Wales. It is a 24 kilometre long distance march in the Brecon Beacons of Wales that takes place at the end of the first week of the selection course. It is used as the first major indicator of whether a candidate has the physical and mental determination to complete the selection course.