Race day has begun as the approximate 2,500 participants took to the Kailua Bay this morning in the 2018 IRONMAN World Championship brought to you by Amazon in Kailua-Kona, Hawai`i.









Race day has begun as the approximate 2,500 participants took to the Kailua Bay this morning in the 2018 IRONMAN World Championship brought to you by Amazon in Kailua-Kona, Hawai`i.