A long-distance race is an event in which participants run, walk, or jog a set distance. The most popular long-distance race is the MARATHON, which is a race of 26.2 miles. Other long-distance races include ultramarathons, which are races of 50 kilometers or more, and half-marathons, which are races of 13.1 miles. Long-distance races are often held to raise money for charity or to promote physical fitness.