The Tough Mudder race is more like a challenge than a typical distance race. It's long, between 10 and 12 miles, but it has 20 to 25 obstacles that you have to overcome during the run.
There are no times kept at the race. You just wait for your wave and then off you go. Because of this, if you are someone who plans on running the entire race, make sure you go in an earlier wave. There will be a lot of people on the course if you go in a later wave.
At each obstacle, you might encounter a line, so sign up for an earlier heat. Also, even if you are assigned a late start line, you can jump in an earlier heat.
Want to see what it's really like? Here's first person footage running at Tough Mudder Chicago.
The obstacles really take a lot out of you, so even if you are a good runner, you will get very fatigued. I tried my best to hold onto a solid pace throughout the race, but I could sense that I slipped into my "Old Man Shuffle" at times when I was really feeling it.
One nice thing about this race is it is a total body workout. How do I know this? I was sore all over the day after the race! One thing you really should focus on is working against your own body weight to prepare for the obstacles. Some easy things to incorporate would be to do pull-ups, dips, push-ups, and sit-ups.
Here's another video account of the race filmed in a more traditional sense. This is Tough Mudder Wisconsin.
I hope this gives you a clear idea of what the Tough Mudder race is all about. I really enjoy a good challenge, and if you run the whole way, this is will tax you physically and mentally.
David Tiefenthaler is the founder and main contributor for Tips4Running.com. In addition to running, he's also an author, and a full time teacher.