weet-bix kids tryathlon park – new zealand's first triathlon for children was held at st. heliers in 1992 and attracted approximately 500 participants. children compete over distances starting with a 50-metre swim, 4-kilometre cycle and 1-kilometre run. since 1992 this event has grown considerably with 20,000 children competing in one of the 13 tryathlons around the country in 2013.