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
Colorado Colfax Marathon Kindergarten to 8th grade students. It is a run that is only . The students run the other in training. The training lasts from February to early May. The race is usually planned to be held in the middle of May. The event is held at the Colorado Mills Mall. The students run through a path in the parking lot around the mall area. Colorado Colfax Marathon The Colorado Colfax Marathon is an annual marathon foot-race established in 2006 in Colorado, United States. The course followed Colfax Avenue for 26.2 miles (42.2 km), starting in Aurora, heading west through Denver