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
Antarctic Ice Marathon & 100k ultra race the Antarctic and experience anything from subzero temperatures to 24 hours of daylight while there. Antarctic Ice Marathon & 100k ultra race The Antarctic Ice Marathon was established by Richard Donovan / Polar Running Adventures to enable marathon runners to complete a marathon on all seven continents. It also enables athletes to complete the marathon grand slam - a marathon on all seven continents and the North Pole. Runnings of the Antarctic Ice Marathon and 100 km race have taken place at 80° south just a few hundred miles from the South Pole at the foot of the Ellsworth Mountains.