LOUISVILLE, Ky. (WHAS11) -- Sunday, athletes from around the world with be in Louisville to compete in the Ironman Triathlon.
The Ironman is not just another triathlon. Athletes must complete a 2.4 mile swim, more than 100 miles on a bike and the run a full 26.2 mile marathon.
The top tier athletes have been training and preparing for months, but there is one thin they can never prepare for - the weather.
It will be very ho and humid Sunday and temperatures are forecast to be in the mid 90s. Combine that with a heat index of more than 100, and that makes for dangerous conditions even for the best athletes in the world.
"Nearly starting from today, we are just over three days out, you just want to be monitoring your hydration level and how much your are drinking during the day and make sure your are staying on top of it. People don't realize if your are thirsty, it is already too late, you are slightly dehydrated," Ironman competitor Kate Belivaqua said.
"We are going to have 95-96 degrees but to me that is not the number we should be looking at. It is the heat index and dewpoint. If the dewpoint is low you are still going to get evaporation and there will be cooling," Chris McDonald, competitor said.