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L.A. Natural Muscle Mayhem

A WNBF Pro Qualifying Event

Learn More




WNBF Professional natural bodybuilder and promoter Jennifer Petinaud is proud to be hosting the inaugural Los Angeles Muscle Mayhem at the performing arts center at Los Osos High School in Rancho Cucamonga, CA.  Co-promoting this event are Bob Bell & Tina Smith of California Natural Muscle.

As lifetime natural athletes, the promoters of the event believe strongly in the integrity of the World Natural Bodybuilding Federation, and their mission is to educate and encourage the art, and science of drug free strength training and bodybuilding. Jennifer, Bob, and Tina, have been providing seminars to local high school classes about the dangers of steroids and other performance enhancing drugs, while educating students about the attributes of weight training and leading a healthy lifestyle. It is hoped that this message will help to eventually change the poor image often associated with drug use in bodybuilding.

We are proud of the many men and women who will be competing in the WNBF Amateur L.A. Natural Muscle  Mayhem, and hope that this event will be a wonderful culminating experience for all of their hard training.  We would like to encourage you to attend this event in Rancho Cucamonga, California on August 19, 2017.  We also thank you for supporting this fantastic sport, and for encouraging all athletes to stay drug free.  Extra special thanks to Cellucor for their amazing partnership and support to the WNBF, our athletes, and Natural Bodybuilding!


2017 WNBF Pro Qualifier

Los Angeles Muscle Mayhem


Los Osos High School

6001 Milliken Ave.

Rancho Cucamonga, CA 91737


Saturday, August 19th, 2017

Prejudging: 11:00am

Finals: 2:00pm



Ontario Airport Hotel

700 N Haven Ave 

Ontario, CA 91764

(909) 980-0400

Book Now

Market Broiler

4553 E. Mills Circle,

Ontario, CA 91764

(909) 581-0866

LAMM Tickets & T-Shirts


Prejudging: $15.00

Finals: $30.00

Prejudging + Finals: $40.00 ($5 savings)

Men's T-Shirts
Women's T-Shirts

T-Shirt: $25.00

2 T-Shirt Combo: $45.00 ($5 savings)

After you purchase your ticket(s) and/or t-shirt(s), they will ONLY be available for pick up AT THE SHOW on Saturday @ Will-Call/Ticket Booth.

PLEASE NOTE: NO Tickets or T-shirts will be mailed. They’re available for PICK-UP ONLY at Will-Call. No refunds will be given for Tickets or T-Shirts. 

Photography & Tanning

ON-SITE Tanning, Hair/Make-Up & Organic Teeth Whitening by Ultra Tanning & Contempo Day Spa

*reference LAMM show when you schedule

Get the Prep Sheet Here

Ultra Tanning & Contempo Day Spa
Salon: (909) 599-6655 or
Text Jaime: (909) 896-9604

Contact Jaime Farraj

Information for Competitors

The L.A. Natural Muscle Mayhem Entry

Promoter: Jennifer Petinaud 909-621-0066

Location: Los Osos High School 6001 Milliken Ave. Rancho Cucamonga, CA 91737

Contest Times:
Prejudging – 11:00am 

Finals – 2:00pm
Mandatory Athlete Meeting Saturday 10:00am at LOHS 

Tickets: Prejudging: $15 Finals: $30 

Hotel: Ontario Airport Hotel & Conference Center 700 N Haven Ave Ontario, CA 91764

Special Rate: $99 Reservations must be made no later than July 17th Code= G-LAMM 

Entry: The Entry fee is $60 for the initial division of competition, and $40 for each additional division entered. Polygraph Fee is $50, WNBF membership registration is $60.

Eligibility: The competition is open to all amateur athletes who have not at any time during the 7 years prior to this event engaged in the personal use of anabolic steroids, other growth enhancing drugs, or prescription diuretics. Pro hormone compounds, and Many other banned substances have varying time bans and/or amnesty periods. It is the athlete’s sole responsibility to check all supplement ingredients. Refer to the WNBF Banned substances list at and contact promoter with any questions.

Testing & Check-in: Every competitor will take a polygraph examination set by appointment. Appointments are set in order of entries received. The fee for polygraph is $50, payable with entry. Testing is good for 60 days of WNBF events. Open and overall winners will be urine tested. Promoters have the discretion to ask any competitor to submit a specimen for urine testing. WNBF amateur membership is required to compete. All contestants must present a current WNBF card at check-in or new WNBF cards are $60 and may be purchased online. You will be required to sign a liability release as a standard procedure at check-in. 

Weight Classes: Women Open BBing: under/over 118 lbs

Men Open BBing: Light= under 165, Middle = 165 ¼ – 176, Light Hvy = 176 ¼ – 190, Heavy = over 190

Novice BBing: Bikini, Fit Body & Men’s Physique by height

Promoter may adjust classes based upon number of entries

Competition Guidelines: Appropriate coverage of all suits, no thongs allowed, no props on stage, BBing music = 60 seconds maximum, no profanity. All posing and judging guidelines at or

*Age & Gender required in order to see classes.

Contact Us With Any Questions You Have About Our Events!

Click HERE to contact us.

Contact Name: Jennifer Petinaud
Contact Email:
Contact Number: (909) 621-0066press option 4

Everyone must be polygraph tested before the event. Polygraphs will take place at the Hyatt Place Hotel in Ontario. Your WNBF membership, polygraph, and entry fee can be paid all at once. The membership is good for 1 year. Within that year, you can compete in other WNBF events (Monrovia, Sacramento, San Francisco, Tempe, AZ just to name a few).

Click HERE for other show details.