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
The whole nine yards origin, though many early published quotations are now available for study. A vast number of explanations for this phrase has been suggested; many of these are no longer viable in light of what is now known about the phrase's history. The whole nine yards "The whole nine yards" or "the full nine yards" is a colloquial American English phrase meaning "everything, the whole lot" or, when used as an adjective, "all the way", as in, "The Army came out and gave us the whole nine yards on how they use space systems." Its origin is unknown and has been described