Long-distance running only the placing is of importance. Other less popular variants such as fell running, trail running, mountain running and tower running combine the challenge of distance with a significant incline or change of elevation as part of the course. Multisport races frequently include endurance running. Triathlon, as defined by the International Triathlon Union, may feature running sections ranging from five kilometres (3.1 mi) to the marathon distance (42.195 kilometres, or 26 miles and 385 yards), depending on the race type. The related sport of duathlon is a combination of cycling and distance running. Previous versions of the modern pentathlon incorporated
North Pole Marathon - a wheelchair competitor - completed a marathon distance on the aircraft runway. North Pole Marathon The North Pole Marathon is run over the classic 42.195 km (26.2 miles) marathon distance at the North Pole. The race is run on small, 4.22 km (2.62-mile) loop about 10 times over hard snow or the frozen ice of the Arctic Ocean. There are individual competitions with male and female divisions, and a team competition for teams of three or more. There is also an option to run a half marathon. The North Pole Marathon has been recognized by Guinness World Records as