The First Ironman Triathlon was in Kona, Hawaii. Arranged by a Navy Commander John Collins. It was a combination of the three longest individual events for each of the sports. It consisted of the Waikiki Roughwater Swim (2.4 miles), Around-Oahu Bike Race (115 miles, originally a two-day event), and the Honolulu Marathon (26.2 miles)
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The first Ironman Triathlon took place on February 18, 1978, but it wasn't the organized event you see today. A Naval commander came up with the idea after he and his buddies were "discussing" who was the fittest athlete - the runner, the biker or the swimmer.
Having done triathlons before Commander John Collins suggested that the guys settle the debate by doing three of Hawaii's big races back to back. The races were the Honolulu Marathon, The Around-Oahu Bike Race, and the Waikiki Rough Water Swim. They were all very close to the race distances Ironman supports today. (The Around Oahu Bike Race was 3 miles longer, but for logistics the guys chopped off those 3 miles).
Gordon Haller was the first to earn the title Ironman by completing the course, with a time of 11 hours, 46 minutes, and 58 seconds. That time has since been eclipsed, in 1996 Luc Van Lierde with a time of 8 hours 4 minutes 8 seconds.
Paula Newby-Fraser, she won eight times: 1986, 1988-1989, 1991-1994, and 1996.
For men, it's Mark Allen and Dave Scott (both of them six times).
Gordon Haller in 11 hrs 46 minutes 58 seconds - not a bad time considering they didn[t know if it could be done!
The the very first Ironman Triathalon was in 1978. It was first held in Waikiki, Hawaii, to avoid Honolulu's traffic.