Last weekend Dwight and I participated in the Mud Run at Camp Pendleton (one of the largest military bases in the United States that provides training facilities for the Marines, Army and Navy units).
This was the most fun I've every had running a 10K!
The Mud Run is a challenging 10K run with hills, tire obstacles, river crossings, two 5-foot walls with mud on both sides, tunnel crawl, slippery hill climb, and the final 30-foot mud pit. They even place a 2 hour 45 minute time limit on the completion of the course (NO SWEAT!).
We are definitely going to do this again next year!
This would be fun to do as a group--Anyone up for joining us?

