Almost 3000 athletes from over 20 different countries are taking on Ironman Louisville 2009 today.
Australian Luke McKenzie, a two-time Ironman
champ South Africa' s Raynard Tissink with five Ironman titles are favorite to win on the men' s side.
Kramer-Postma Nina Kraft, Fernanda Keller will battle Lisbeth Kristensen as she tries to
defend her title on the women' s side of the race
The 2.4 mile swim, followed by the 112 mile bike, followed by the marathon run will test them to the extreme.
You can watch the Ironman Louisville 2009 race live HERE and keep up with the athletes HERE.
And you can get full results of both the professional and amatuer race HERE as well as track the athletes progress.