Mountain running is off-road running over the toughest terrain. It is also called fell running or hill running. The sport requires navigation and survival skills. King Canmore of Scotland is credited with organising the first race in 1040 in order to choose a suitable messenger. Nowadays, there are over 500 races annually in the UK alone. The Ben Nevis and the Snowden race are the most popular. Race categories are based on ascent and distance, with the 24-hour challenge being the ultimate goal in the amateur sport. No specialist equipment is needed, just a pair of trainers a competitive streak and often a lightweight waterproof..