Down & Dirty Dallas
A name like Down & Dirty doesn't leave much to the imagination. Choose to run 3 or 6 miles, and tackle 20+ obstacles. If that doesn't sound difficult enough, you can choose to run in the brick division - racers are given bricks to carry with them through the course!
Some of the proceeds from the races (held across the country) are donated to Operation Gratitude, a non-profit which sends care packages to deployed military members overseas.