There's this race in Chicago in the fall called the Urbanathlon. I think it's like 10.something miles, and there's all these obstacles during it. Like running over cars, climbing a small wall with a rope, going across monkey bars, etc.. You can do it by yourself and run the whole thing, or have a team of 3, and each person does 3.something miles. It looks like fun, and Josh and I want to do it next year! You can help each other during the race...like if you can't make it over the wall, someone can help you, etc..
Here's the website for the race this year.
http://www.menshealthurbanathlon.com/We're not going to do it this year, because it's coming up quickly, and there's no way I can 10-something miles right now! But next year, I want to! It'll probably be in October next year. You should doooo it!