Strict adherence to our drug testing policy is required for every competitor. All shows are tested with polygraph and urinalysis. Read more about banned substances.
There are five categories that athletes may compete in, both in the Amateur and Pro divisions. Learn more about WNBF Judging Criteria.
Natural Muscle Mayhem is growing and we’re looking for organized, professional, motivated individuals to expand our brand. Learn more about becoming a promoter.
WNBF is the largest and most respected natural bodybuilding organization, with over 50 shows throughout the U.S. and abroad. Learn more about WNBF.
Watch the very best natural bodybuildering, physique, and fitness athletes in action.
RESULTS: 2017 L.A. Muscle Mayhem
Rancho Cucamonga, CA
Introducing Koffee Reinvented
Rancho Cucamonga, CA
Introducing West Coast Muscle!
Battle of the Bay Partner
RESULTS: 2017 Pro USA & Mayhem
July 15, 2017, Sacramento