The Ironman World Championship, which has been held annually in Hawaii since 1978, with an additional race in 1982, involves which sport?
Triathlon Triathlon Distance Triathlete Sprint Distance Triathlon Long Distance Triathlon Beginner triathlon training Olympic Distance Triathlon Full Distance Triathlon Beginner Triathlon Training Triathalon Long distance triathlon Triathlons Full distance triathlon Tri-athlete Triathlon training Triathletes Iron distance triathlon