noun - Aquathlons consist of a continuous, two-stage race involving swimming followed by running. The International Triathlon Union (ITU) and its member federation organizations sanction competitions and govern the sport. An aquathlon is also called an "Aquathon." The ITU and USA Triathlon sanctioning organizations generally use the term aquathlon.
Aquathlons have been around in various forms since the early 20th century in ocean lifeguard competitions. The National Surf Lifesaving Association of America, formed in 1965, held its first national competition that year and the events included a run-swim-run. The modern international standard lifeguard distance is 400 meter run - 400 meter swim - 200 meter run.