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
Lisbon Half Marathon architecture, including the Belém Tower and Jerónimos Monastery. From 2008 onwards, the organisers set aside a €50,000 prize pot for any athlete breaking the world record over the half marathon distance. This led to the participation of a number of prominent athletes, with marathon world record holder Haile Gebrselassie winning the 2008 edition, while Charles Kamathi and Robert Kipkoech Cheruiyot followed behind. Another strong field was assembled in 2010 and Zersenay Tadese of Eritrea broke both the 20 kilometres and half marathon world records in his winning run. The competition also hosts a mini marathon race, which has featured many