The common distance for a standard marathon is 26.2 miles (42.195 kilometers). This distance became standardized in the early 20th century and remains consistent in all recognized marathon events. Marathons are held worldwide, attracting both amateur and professional runners. The race typically tests endurance and requires extensive training for participants to prepare adequately. Major marathons, such as the Boston Marathon and the New York City Marathon, have significant cultural and historical importance in the running community.