I started a team for the Tough Mudder Colorado for Saturday June 15, 2013. Right now there is just two of us. I did this last year in Las Vegas, and it was a blast. It's challenging, but not impossible, and very doable with team support. If you've not heard of it check out the website www.toughmudder.com.
If you want to join the team the team name is Down to be Dirty, and the password is dirty. It will be at Beaver Creek, and is 10 to 12 miles of mud, obstacles and fun. I'm signed up for an 11am slot, but they don't tell you your time until a week before the race. Last year we started 40 minutes late and it's not a big deal. This is not a timed event.
Late Entry: March 29-May 16 $145; Final Entry May 17-June 9 $180
Hope to meet some new Tough Mudders