But the family of 28 year-old Avishek Sengupta blames Tough Mudder for the death of their son, reports the American Bazaar.
The 10 to 12 mile course in West Virginia puts competitors in a race through mud, water and soil.
Sengupta jumped into a pool of mud, but somebody jumped on top of him and he struggled to surface.
A lawsuit filed by his family contends the muddied waters violated state regulations, that lanes should have been clearly marked off and that the diver on duty made only a half hearted attempt to get to their son.
The lawsuit says it took 11 minutes to pull him from the pool.