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 stayed with him until Heartbreak Hill, at which point he passed him. Miles completed the race in a time of 2:25:40. His time was so fast that the course was remeasured and found to be 176 yards short. Miles attempted to defend his title at the 1927 Boston Marathon, but dropped out early due to problems with his shoes. In 1929 Miles returned to Boston and won the marathon in a time of 2:33:08. Miles competed in two more Boston Marathons, never finishing higher than 10th. Between his two wins in Boston, Miles won the Canadian 10000 metre championship in