A man died in Texas last year while crossing a river in an outdoor obstacle course similar to Tough Mudder called "The Original Mud Run."

Obstacles in Tough Mudder, including Walk the Plank, are inspected before the race and built after consultation with engineers on safety concerns, Pinakiewicz said.

Participants in the race must sign an extensive waiver acknowledging their awareness of "inherent risks" in the course that can cause permanent disability or death. The form requires signees to "take full responsibility for any and all damages, liabilities, losses, or expenses" they incur as a result of participation.

Mirshah described his longtime friend as a "warm and fuzzy" person, an avid rock climber who didn't curse or drink alcohol.

"I can't describe him in words," Mirshah said. "There aren't adjectives. It's like the definition of tragedy."

Sengupta, Mirshah and Gemp attended Centennial High School together, and Mirshah said they were still mourning the loss of another former classmate, Valerie Cappelaere Delaney, a Naval Academy graduate who died last month in a training accident in Spokane, Wash.

The group joked about Tough Mudder's risks before they began, and took it slowly through the course.

"We said in the car, 'Well, this will be a successful day if no one gets hurt,' " Mirshah said.



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