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
Philadelphia Marathon 5 miles) companion race to the Philadelphia Marathon. This race follows a shorter loop of the marathon, starting off on the expansive Benjamin Franklin Parkway before taking a turn on the scenic banks of the Schuylkill River and Martin Luther King Drive. Each runner receives a T-shirt, a finisher medal and a finisher certificate (available online after the race). The Philadelphia Marathon, who collaborated with Green Mountain Energy partnered with the Mayor’s Office of Sustainability and the Mayor’s Office of Civic Engagement to turn the race into an eco-friendly sporting event. In 2007, the Marathon’s eco-friendly events began with recycling