Triathlon is a hugely popular multi-disciplined sport consisting of a swim section, bike section and finally a run section divided by what is known as transition stages (T1 – swim to bike / T2 – bike to run). Races are continuous with a standard distance (Olympic distance) of 1500m (swim), 40km (bike), 10km (run). The swim section can be held in a pool, lake or in the sea, the bike section can be on or off road (for off-road triathlons) and the run section also on or off roads. 

Triathlon race distances are:

Super Sprint:  Swim 400m / Bike 10km / Run 2.5km  |  1-2 Hours

Sprint: Swim 750m / Bike 20km / Run 5km  |  1-2 Hours

Standard Distance (Olympic):  Swim 1,500m /  Bike 40km / Run 10km  |  2-4 Hours

Middle Distance (Half Iron / 70.3): Swim 1,900m / Bike 90km / Run 21km  |  4-7 Hours

Full Distance (Ironman): Swim 3,800m / Bike 180km / Run 42km  |  8-17 Hours

Ultra Distance Races are held at multiples of Full Distance, typically 2x, 3x, 5x and 10x

Ironman is a long-distance triathlon organised by the World Triathlon Corporation (WTC)

You can find out a whole lot more by visiting the British Triathlon website here