Fell running is a popular adventure sport, also known as hill running and mountain running. In the United States, this popular adventure sport is called trail running. It is a sport in which running and racing is conducted off-road or over upland country where the inclined slope is an important component of difficulty of the race.

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Fell running is specially undertaken by those those athletes with extraordinary skills in mountain navigation and have the power and ability to carry appropriate survival equipment as suggested by the sport organizer.

This sport is divided in many categories, such as category A, B and C. In category A, the distance to be covered by the athlete should average 50 meters climb per kilometer and should be a minimum distance of 1.5 kilometers. In category B, the average distance should be 25 meters climb per kilometer while in category C the average distance is 20 meters climb per kilometer.

Fell runners usually uses light and non-waterproof material to release water and dislodge peat after traversing boggy ground. Ripple soles, spikes and flat soled pumps have been used by fell runners since the 50s.