I've done 2 sprints, 4 olys, and an HIM.
The HIM length is the longest that I want to do. I don't have the time to properly train for a full Iron.
None - triathletes are crazy!
None - but I'm going to do one this year.
Sprint
Olympic
ITU Long Distance ("double Olympic")
Half-Ironman
Ironman
I've done 2 sprints, 4 olys, and an HIM.
The HIM length is the longest that I want to do. I don't have the time to properly train for a full Iron.