Any opinions on the best triathlon in Denver?

So this is not in Denver and it’s not a triathlon but the Tough Mudder in Beaver Creek is supposed to awesome! It regularly gets around 5,000 people who participate and looks to be the toughest race around! I have known people who have done it and they say it is the most exhilarating thing they ever. Not only do you push your body to the limit by racing over 10 mile but you also have to complete 25 different obstacle courses like army crawling through mud under barb wire! I would love to participate next year, anyone want to join me?

Well, there's always the Denver triathlon. I honestly don't know of any others, haha.