Rampage Fitness Academy Team

David C. Roberts OWNER

David Roberts is the Co-owner and Head Muay Thai coach here at Rampage Fitness. David grew up with Quinton “Rampage” Jackson in Tennessee where before becoming friends they were actually wrestling rivals. After meeting in several high school Regional and State qualifying tournaments and having some epic wrestling battles they started to find things in common and became fast friends. Here 15 years later they are still training partners and good friends. In addition to a great wrestling pedigree Mr. Roberts is a Muay Thai champion in Thailand, a 2012 Pan-Am Jiu-jitsu Gold Medalist, and an Mixed Martial Arts pioneer having fought in UFC 20.

Education and Certifications

  • Purple Belt 4 Stripes Brazilian Jiu-jitsu
  • UFC Veteran at the age of 19 (one of the youngest to ever fight in the UFC)

Interests and Achievements2012 Pan Am No Gi Champ

  • 2012 Pan-Am Jiu-jitsu Gold Medalist
  • 2012 Brazilian Jiu-jitsu Miami Open Silver Medalist
  • 2006 World Muay Thai Champion
  • 2 time CFA Middle Weight Champion

Michael is our Vice President in addition to teaching Beginning Jiu-jitsu, Muay Thai and fighters here at Rampage Fitness Academy.

“I love my profession and feel grateful and excited to be doing what I love while helping change lives. Fitness has not always been a part of my life, I was not involved in sports as a child, at the age of 14 I found Martial Arts where I earned my first Black Belt at 20 and went on to be a Regional Champion and an Award Winning Instructor.   I learned strength, humility, perseverance, dedication, and confidence through challenging myself physically and mentally, each day I strive to give each individual the tools necessary to experience the same transformation. Each day has it’s challenges.  Never give up, never make excuses, never let yourself off easy, never let yourself stop growing, you must constantly push yourself to be better than you ever thought you could be.  This is my motto, and the vision I try to impart to all my students and clients each day.”

Education and Certifications

  • Brown Belt 4 Stripes Brazilian Jiu-jitsu
  • Black Belt Doce Pares Escrima
  • Black Belt 2 Stripes Eskrido
  • Black Belt Shotokan Karate
  • Black Belt Japanese Jiu-jitsu
  • Instructor In Jeet Kune Do, Kali, Silat, Savate
  • Bachelor of Arts, Magna Cum Laude, Sport Psychology, Minor Exercise Science WWU


Interests and Achievements

  •  2010 No Gi World Champion Gold Medalist
  •  2011 No Gi World Silver Medalist
  • Pro Fight Coach with a 90% win Ratio
  • National and International Brazilian Jiu-jitsu Competitor
  • Holds Black Belts Level in 9 Different Martial Arts
  • Alternative Forms of Functional Fitness


Angel is the first person you see when you walk into Rampage Fitness Academy. She works at the front desk and is our Social Media rep. (Follow the gym on Facebook.com/rampageacademy for updates and Instagram @rampagefitnessacademy for daily photos!) When she’s not here, she works at Posch lounge in Irvine as a bottle server. She’s also getting certified to become a Pharmacy Technician. In the long run, she’d like to become a Pharmaceutical Sales Representative and travel the country. During her free time at work, she does cardio kickboxing with Dan Doran and Dave Roberts. On her rare days off, she likes to go to LA and check out all the hot spots. She loves to meet new people and get to know every one of our members, so when you come in make sure to take a few minutes to hang out with Angel!


Kirsten is our in-house Fitness Nutrition Specialist and Kickboxing Instructor, Kirsten Runstrom has been training in Muay Thai and competitive Kickboxing for several years and has always been a dedicated practitioner, eager to learn more. A passionate advocate for healthy and active lifestyles, she holds her certification in Fitness Nutrition from NASM, the National Academy of Sports Medicine. In addition to helping people every day to reach their weight loss goals, she also specializes in gluten free and allergy diets. In her spare time she enjoys running, baking, horseback riding, mountain biking, and camping.


Daniel Doran is an Instructor and Sales Manager at Rampage Fitness Academy. He began training in Muay Thai in 2009 and in 2010 began training in Brazilian Jiu Jitsu, and is currently a Blue Belt working towards his Purple Belt. Daniel was born in Torrance CA, and raised in Yucca Valley, CA. From 2005-2009, he attended Vanguard University of Southern California in Costa Mesa. He graduated with a double major in Cultural Anthropology and Business Management. After 3 years of hard work and training, he found his home at Rampage Fitness Academy.


Jose is a Children’s and Cardio Kickboxing Instructor at Rampage Fitness. He has been an athlete since he was a child, wrestling at Tesoro High School where he was a State wrestling qualifier, placing 3rd in State with a record of 54+ wins. In addition, Jose is a Blue Belt in Brazilian Jiu-jitsu and great competitor. Jose is a volunteer Fire Fighter and is a soon to be Orange County Fire Fighter. When not here teaching he is right across the parking lot over at Oggi’s Pizza delivering the best customer service in the business with his charming smile. If you are in the neighborhood stop in and say hi.

Kelvin Nimsiriruengphol INSTRUCTOR

Kelvin is a Cardio Kickboxing and Children’s Class Instructor at Rampage Fitness. He started training martial arts at 10 years old starting with Taekwondo where he earned a 2nd degree Black Belt. He was a 4 year Varsity Wrestler at Murrieta Valley High School, and started training Brazilian Jiu-jitsu in 2001 under Fabiano Iha. Kelvin is former training partners with Razor Rob McCullough, Zach Light, and other pro MMA Fighters. He is a veteran of Kage Kombat, Battle in the Ballroom, Shooto, and other Pro MMA shows. When not in the gym Kelvin likes to surf the waters and mountain bike the hills around Southern California. A little know fact, Kelvin is half Filipino and half Thai…can you think of a more ferocious warrior?!


Niko is a Fitness Instructor here at Rampage Fitness Academy. “Fitness is a lifestyle, Mixed Martial Arts is mine. Ever since I was a child I was active. I think that’s how everyone starts out until responsibilities kick in. School, work, family duties, all important, and within that so is health. I have asked myself “How am I to help anyone, if I don’t first take care of myself?”. My brother was the captain of the wrestling team and he would always come home and practice his moves on me (whether i was willing or not). I started wrestling in the Hawkeye program at Laguna Hills High School in 8th grade, where I continued into high school.  From there, I furthered my skill and interest in Mixed Martial Arts. I then began to explore other ways of training and building my education. From strength training, to cardio, and anything in between, I soaked up knowledge from many different personal trainers, until I received my first certification. From there on I recognized a true passion of my mine, helping others reach and obtain goals of their own, within fulfilling a goal of mine. MMA is a lifestyle for me, it’s how I eat, how I study, how I communicate, and how I survive. It has granted me so many open doors in life and taught me so much more than I can mention, and for that I am thankful.”


Our Head Black Belt Jiu-jitsu instructor here at Rampage Fitness Academy. Giva has been training Brazillian Jiu Jitsu for 17-years and is a third degree black belt under Lotus Club from Sao Paulo, Brazil. Giva is a passionate instructor and competitor that enjoys teaching Brazilian Jiu Jitsu to his students. Giva’s goal is to continue to impart his extensive knowledge and experience of Brazilian Jiu Jitsu to his students while continuing to improve his game. Santana is a Pan American Black Belt champion for 1999 and 2005.

Competing in a variety of competitions, Santana is well versed in how to prepare for BJJ and MMA. As the head Jiu Jitsu trainer for Rampage Fitness Academy Santana works with each fighter to develop proactive and reactive skills that prepare them for anything they may encounter during a fight. His training schedule is as rigorous as they come, and some of MMAs rising stars accredit their increased stamina and ground game to the work Santana had done with them. Some of those stars include, Robert Emerson, Jared Rollins, Carla Esparza, Fabio Nascimento, Ian Mccall and Shane Del Rosario.



 Is one of our Black Belt Jiu Jitsu Instructors here at Rampage Fitness Academy.   Fabio holds BJJ wins over such legends as Jacare, Demian Maia and Marcelo Garcia. He is a former Brazilian National Boxing Champion, has an undefeated professional Muay Thai record and holds a professional MMA record of 11-5.



Laercio Fernandes is one of the top Jiu jitsu competitors in the pluma weight division aBlack Belt under Giva Santana of lotus club. This fighter from Sao Paulo raise a few eyebrows when in 2010 defeat heavy favorite Ciao Terra on his way to the top of the podium of the U.S. Nationals.

Some of Laercio’s Many Black Belt Notable Wins

  • 2011 Int’l Phoenix Open Champion Absolute Division
  • 2011 Int’l Phoenix Open Champion Weight Division
  • 2010 US National Champion
  • 2010 3rd at World Championship
  • 2010 1st Brazilian National Championship
  • 2010 1st Honolulu Open (3rd in Absolute)
  • 2010 Bronze at European Championship
  • 2010 Bronze at National Cup
  • 2010 Bronze at Sao Paulo Cup
  • 2009 1st American National Championship
  • 2009 1st Sao Paulo State Championship
  • 2008 1st South Brazilian Championship
  • 2008 1st Brazilian National Championship

Other Titles:

  • 8 x Sao Paulo State Champion
  • over 50 other titles