'A Challenge Event is a walk mostly on footpaths and other Public Rights of Way (PROWs), across open fields and moors, avoiding tarmac as much as possible. The challenge is to the individual, e.g. 30 miles in 10 hours, it is NOT a race. The distances include at least one option over 20 miles - commonly 25, 26.2 ( Marathon) - with walks over 50 miles, e.g. 62 miles (100 kilometres) in 26 hours giving qualification for the LDWA's "flagship" Event, held over the Spring Bank Holiday weekend in a different part of the country each year, namely, a Hundred Miles in 48 hours, with a limit of 500 participants.'