The "Marathon Series" refers to a collection of long-distance running events, typically covering a distance of 26.2 miles (42.195 kilometers). These races are held in various locations around the world, attracting both amateur and professional runners. Participants often train for months to prepare for the physical and mental challenges of completing a marathon. Many major cities host their own marathon events, such as the Boston Marathon, New York City Marathon, and London Marathon. These races not only promote fitness and health but also foster community spirit and raise funds for various charitable causes.