Tough Mudder Obstacle Course

After being sprayed with a fire hose, runners slide down the hill during the “greased lightning” course in Temecula.  (Allen J. Schaben / Los Angeles Times)

Tough Mudder competitor David Duong, right, of Los Angeles, lets out a yell as he falls in the mud after being shocked in the “electroshock therapy” course.  (Allen J. Schaben / Los Angeles Times)

A masked David Duong of Los Angeles gives a victory shout as he finishes the Temecula hills course.  (Allen J. Schaben / Los Angeles Times)

A Tough Mudder runners can get help from teammates to scamble up a ramp.  (Allen J. Schaben / Los Angeles Times)

One competitor doesn’t need help as he makes a running leap up the ramp.  (Allen J. Schaben / Los Angeles Times)

A Tough Mudder runner celebrates making it to the top after a running leap up a near-vertical ramp.  (Allen J. Schaben / Los Angeles Times)

Tough Mudder runners make their way over water in the “spread eagle” wall course.  (Allen J. Schaben / Los Angeles Times)

A competitor endures shocks as he runs through the mud, water and hay bales.  (Allen J. Schaben / Los Angeles Times)

After getting shocked, a runner tumbles into the mud.  (Allen J. Schaben / Los Angeles Times)

Teamwork gets runners over a rope wall.  (Allen J. Schaben / Los Angeles Times)

Members of the Mud Flaps team help each other cross the rope wall.   (Allen J. Schaben / Los Angeles Times)

Carrying heavy logs up and down a hill is part of the competition.   (Allen J. Schaben / Los Angeles Times)

A Tough Mudder runner celebrates making it to the top of the “cliff hanger” course, where they are sprayed with water as they climb a hill near Temecula.  (Allen J. Schaben / Los Angeles Times)

A competitor gets a mud bath after sliding down the hill on the “greased lightning” course.  (Allen J. Schaben / Los Angeles Times)

Exhaustion shows at the end of the “electroshock therapy” obstacle.   (Allen J. Schaben / Los Angeles Times)