Duathlon is a run bike run event. It's a simple as that. You run. Then you bike. Then you run. Period.
You can also do a Run - Bike - Run - Bike - Run event. Which according to a quick websearch makes you a Mosquitoman. Suddenly the Ironman brand doesn't look quite as prestigious.
Duathlon is not Biathlon. Biathlon is a rare mix of ski-ing and Shooting. If they have bobbles on their heads and guns on their backs THAT'S NOT WHAT I DO! (I quite fancy the XC ski-ing but I really don't think my shooting is up to it)
Duathlon is not a Run - Bike - Wheelchair event. 
Duathlon is not a Run - Bike - Build event. 
I love Peanut Butter and I love Peanut Butter. But i have NO idea what a Peanut Butter Duathlon is. However I am very interested. Run - Bagel - Run Event???
So to recap. All you need for Duathlon is trainers and some sweet wheels....
