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
Swimming at the 2012 Summer Olympics – Women's marathon 10 kilometre Swimming at the 2012 Summer Olympics – Women's marathon 10 kilometre The women's marathon swimming over a distance of 10 kilometres at the 2012 Olympic Games in London took place on 9 August in the Serpentine at Hyde Park in London, United Kingdom. Hungary's Éva Risztov ended her eight-year absence from Olympic action to capture the women's 10 km marathon title in open water swimming. Leading most of the stretch in a grueling race, she held off a late resistant surge from American teen Haley Anderson on the last 50 metres to slam the timing touch pads and claim her