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
Johnny Miles boots. In 1926 Miles's neighbours raised a few hundred dollars to send him to the Boston Marathon by train. This would be Miles's debut marathon, having never run a race longer than 10 miles. The field at the 1926 Boston Marathon included four-time winner Clarence DeMar and 1924 Olympic champion Albin Stenroos, whom Miles idolized. Miles arrived at the marathon as an unknown, competing in a handmade singlet adorned with a maple leaf and the letters "NS" for Nova Scotia and a pair of 98-cent sneakers. Stenroos attempted to break away after the first few miles, leaving DeMar behind. Miles