Triathlon races vary in distance. According to the International Triathlon Union and USA Triathlon, the main international race distances are Sprint distance (750m swim, 20 km bike, 5 km run), Intermediate (or Standard) distance, commonly referred to as "Olympic distance" (1.5 km swim, 40 km ride, 10 km run), the Long Course or 70.3 (1.9 km swim, 90 km ride, 21.1 km run, such as the Half Ironman), and Ultra Distance (3.8 km swim, 180 km ride, and a marathon: 42.2 km run); the most recognized branded Ultra Distance is the Ironman triathlon.
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