Cycling, Rowing, Motorcross. ANY sport done at a world class level is extremely tough.

I was fortunate enough to see the Ironman world Championship in Kona this past fall, That **** is no joke.....at the world class level.
how about 46 min for a 2.4 mile open water swim.
I think the fastest bike split was 4:37 for 112 miles (24mph+ average) and then run a 2:40 marathon.


I remember reading somewhere that someone posted the question to Lance Armstong in regards to who are the fittest athletes in the world. His answer? World class Triathletes. He should know, didn't he race with the Pros when he was 16?