Brownlees goal is to become the first person to complete the Ironman distance39-kilometer open water swim and 180-kilometer cycle followed by a full marathonin under seven hours. A mens triathlon and a womens triathlon. Triathlon Distances Miles Kms Average Sprint Ironman Times Next spring Brownlees goal is to become the first person to complete an Ironman race a 39 kilometre open water swim a 180km cycle followed by a full marathon in under seven hours hence the name requiring him to break the record by more than 51 minutes. Olympic distance triathlon times brownlee . The mens triathlon competition was a day of many firsts for the Olympic sport. Brownlee who won gold at London 2012 and Rio 2016 continued to race and only found out while on the 10km run after finishing the swim and bike section. There are usually two events. As many before him have found Olympic dominance is no guarantee of immediate Ironman success. But that does not mean his impact in sport in Tokyo and b...