IRONMAN 70.3 California started out as an IRONMAN in 2000. Two years later it was turned into one of the first IRONMAN 70.3 events and helped launch the popularity of the distance. Oceanside, California offers triathletes a chance to race in the region that birthed the sport in the early 1970s in Mission Bay. Oceanside is located at the northern end of San Diego’s North County, which includes the beach communities of Del Mar, Cardiff, Encinitas, and Carlsbad—home to surf, triathlon, and beach cu