Middle distance triathlons are also commonly known as 'half ironman' or '70.3' The 70.3 refers to the total distance covered in miles - a 1.2-mile swim (1.9km), a 56-mile bike ride (90km), and a 13.1-mile run (21.1km).
Those events with the capitalised 'half IRONMAN' branding are organised by the World Triathlon Corporation (WTC) and competitors must be aged 18 or older on race day.
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