Duathlon

A duathlon is a multisport race that consists of three continuous and sequential stages: running, cycling, and running. The distances of each stage can vary significantly depending on the event and age group, but the order of events remains constant. Duathlons are often categorized by their length. Common formats include the "Sprint Duathlon" (typically 5 km run, 20 km cycle, 2.5 km run), "Standard Duathlon" or "Classic Duathlon" (often 10 km run, 40 km cycle, 5 km run), and "Long Course Duathlon" (distances can be much greater).

The sport originated from the need for alternative training for athletes who might not have easy access to water for swimming, a component of the related sport of triathlon. However, duathlon has evolved into a standalone competitive discipline with its own championships and governing bodies. Participants require a road-worthy bicycle and safety equipment, most notably a helmet, which is mandatory during the cycling leg. Transitions between disciplines, known as T1 (run to bike) and T2 (bike to run), are critical parts of the race where athletes change equipment and prepare for the next leg. Strategy, pacing, and efficient transitions are key to success in duathlon racing.