30% of the race distance on road. Category C Should average not less than 20 metres climb per kilometre. Should contain some genuine fell terrain. Should not have more than 40% of the race distance on road. Distance Categories Category L A category "L” (long) race is 20 kilometres or over. Category M A category "M” (medium) race is over 10 kilometres but less than 20 kilometres. Category S A category "S” (short) race is 10 kilometres or less. Additional categories Category O also known as a Long O event checkpoints are revealed to each competitor when they come up to a "staggered" start entry by choosing an orienteering type class, such as a Score-O event and often as a team of two (pairs) Category MM events also known as mountain marathons and mountain trials similar to Category O, but multi-day events, in wild, mountainous country. Competitors must carry all the equipment and food required for the overnight camp and subsequent days. Entry is usually as a pair. Three example "classic A" races Ben Nevis Race AM 10 miles (16 km) 4,400 ft (1340 m) - male record 1:25:34 (Kenny Stuart, 1984), female record 1:43:01 (Victoria Wilkinson, 2018) Blisco Dash AS 5 miles (8.1 km) 2,000 ft (610 m) - male record 36:01 (Jack Maitland, 1987), female record 44:34 (Hannah Horsburgh, 2018) Wasdale Fell Race AL 21 miles (34 km) 9,000 ft (2750 m) - male record 3:25:21 (Billy Bland, 1982), female record 4:12:17 (Janet McIver and Jackie Lee, 2008) Footwear Modern fell-running trainers use light, non-waterproof material to eject water and dislodge peat after traversing boggy ground. While the trainer needs to be supple, to grip an uneven, slippery surface, a degree of side protection against rock and scree (loose stones) may be provided. Rubber studs have been the mode for two decades, preceded by ripple soles, spikes and the flat-soled "pumps" of the fifties. 24-hour challenges Fell runners have set many of the peak bagging records in the UK. In 1932 the Lakeland runner Bob Graham set a record of 42 Lakeland peaks in 24 hours. His feat, now known as the Bob Graham Round, was not repeated for many years (in 1960); by 2011, however, it had become a fell runner's test-piece, and had been repeated by more than 1,610 people. Building on the basic 'Round' later runners such as Eric Beard (56 tops in 1963) and