Early triathlons were held as offbeat training exercises for runners. The first known swim/bike/run triathlons were held at San Diego's Mission Bay in 1974. Organized by members of the San Diego Track Club, the events were held on summer evenings and were intended as no more than light-hearted breaks in the normal grind of training for marathons and 10Ks. One athlete who raced at the first Mission Bay Triathlon, John Collins, was very influential in the further development of the sport. Collins, a U.S. Naval Officer, took the triathlon concept to Hawaii and used it several years later to combine three of Oahu' s endurance events - the Waikiki Rough Water Swim, the Around-Oahu Bike Ride and the Honolulu Marathon into one race: the Ironman.