A man holds his breath as he shoots through the hazard “Fire in Your Hole,” while competing in the 10.3-mile Tough Mudder obstacle course in Westbrook on Saturday.

Cameron Smith, left ,of Boston, and Lenier Harley, right, of Bronx, N.Y., help Tim Morris of New York get back in his wheelchair after he crawled through the “Kiss of Mud” during the Tough Mudder obstacle course in Westbrook on Saturday.

A competitor in the Tough Mudder obstacle course crawls through the “Kiss the Mud” hazard while competing in the race in Westbrook on Saturday.

Sean McLean of Scarborough, top, pulls a fellow competitor up the finish of the “Mud Mile” while competing in the Tough Mudder obstacle course in Westbrook on Saturday.

A competitor works his way through the mud mile during the Tough Mudder obstacle course, a 10.3-mile trail run littered with obstacles and hazards in Westbrook on Saturday.

Nina Perez of Ludlow, Mass., dives backward as she comes out of the "Sewer Outlet," one of the 20 hazards lining the 10.3 mile Tough Mudder obstacle course in Westbrook on Saturday.

A team helps one of its members climb the human pyramid while competing in the Tough Mudder obstacle course,on Saturday.

Patricipants in the Tough Mudder obstacle course make their way through the mud mile during the race in Westbrook on Saturday. )

A man holds his breath as he shoots through the hazard "Fire in Your Hole," while competing in the 10.3-mile Tough Mudder obstacle course in Westbrook on Saturday.

Spectators watch as participants in the Tough Mudder obstacle course make their way across the Funky Monkey, a set of monkey bars suspended over water. Gabe Souza/Staff Photographer

A group of competitors dressed as Smurfs stretch before the start of the Tough Mudder obstacle course on Saturday.

Participants in the Tough Mudder obstacle course compete in the "Electroshock Therapy," a hazard that delivers tiny shocks as the participants run through it before crossing the finish line on Saturday.

Thien Than Su Chet of upstate New York, dressed head to toe as Star Wars character Darth Vader, walks the Tough Mudder obstacle course after crawling through the kiss of mud obstacle on Saturday. Chet said he has competed in numerous races.

Competitors in the Tough Mudder obstacle course help pull each other up the human pyramid on Saturday.

Thien Than Su Chet of upstate New York, dressed head to toe as Star Wars character Darth Vader, cleans the mud off his costume after crawling through the kiss of mud obstacle as part of the Tough Mudder obstacle course in Westbrook on Saturday.

David Northcutt of Madison, Wis., braces himself as he slides through the "Fire in Your Hole" hazard while competing in the Tough Mudder obstacle courseon Saturday.

A group of hands help a fellow participant scale a wall in the Mud Mile.

A participant in the Tough Mudder obstacle course braces himself as he helps a fellow competitor climb up the human pyramid.

Participants in the Tough Mudder obstacle course compete in the "Kiss the Mud" challenge.