One of the competitors in the Spartan challenge race gives a primal scream after sliding into a mud bog Sunday, Sept. 15 as part of the challenge course. The annual Seattle Spartan obstacle race is held in Monroe, past the high school, on the grounds of the Meadow Wood Equestrian Center. Hundreds of competitors descend upon the edge of Monroe to test their strength and endurance by climbing rope walls, carrying heavy items, running through terrain and more.