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
Athletics at the 1904 Summer Olympics – Men's marathon research on "purposeful dehydration," even though dehydration is potentially fatal. The marathon ended with the worst ratio of entrants to finishers (14 of 32) and by far the slowest winning time, 3:28:45, almost 30 minutes slower than the second slowest winning time. These were the standing world and Olympic records (in hours) prior to the 1904 Summer Olympics. "(*)" Distance was also 40 kilometres The first to arrive at the finish line was American runner Fred Lorz, who had actually dropped out of the race after nine miles and hitched a ride back to the stadium in a car, waving