O2 Martial Arts Academy (formally known as Academia Casca Grossa de Jiu-Jitsu or the Relson Gracie Jiu-Jitsu Aiea Academy) is based out of Aiea, Oahu, Hawaii. We are a Relson Gracie Jiu-Jitsu Association and part of the Relson Gracie Team. O2 Martial Arts Academy has the honor of being the FIRST Relson Gracie Jiu-Jitsu association school worldwide. The Gracie Jiu-Jitsu and Submission Wrestling classes are led by head instructors Chris and Mike Onzuka, Kaleo Hosaka, Robert Moss, Grant Arakawa, Chris Slavens, Travis Kashiwa, and Andrew Kawada. We have the honor of having 8 Relson Gracie Black Belts teaching our of O2 Martial Arts Academy. Chris and Mike were two of only four instructors that were hand picked by Relson Gracie and specifically trained to open Relson’s FIRST satellite/association academy in 1995. Chris (7th degree) and Mike (7th degree) Onzuka, Kaleo Hosaka (4th degree), Robert Moss (3rd degree), Grant Arakawa (1st degree), Chris Slavens, Travis Kashiwa (1st degree), and Andrew Kawada are all Relson Gracie Jiu-Jitsu black belts. All of them won numerous state Brazilian Jiu-Jitsu champions and multiple time competitors in the World Championships of Brazilian Jiu-Jitsu (Mundials) and Pan American Jiu-Jitsu Championships. Mike and Kaleo were also a successful competitor in Judo and has earned a brown belt from the prestigious Shobukan Judo Club and Kaleo earned his brown belt from the Leeward Judo Club.
Coupled with its established grappling program, O2 features a top notch boxing and kickboxing program instructed by PJ Dean, Chris Slavens, and Justin Dulay. PJ has both held numerous boxing and kickboxing titles as well is a successful MMA competitor. PJ is also a Gracie Jiu-Jitsu purple belt and has won numerous state GJJ championships. Chris Slavens has an extensive background in amateur boxing, capturing state titles in two different weight classes and has competed in the Amateur Fighting Competition, in addition to being a black belt in Gracie Jiu-Jitsu. Justin was a student and built from the ground up by Chris and PJ and has incorporated all his knowledge and has become an incredible instructor sharing his knowledge to the rest of the team as an instructor and is also a kickboxing champion.
O2 has recently added a wrestling program to the disciplines offered. Whether you want to use wrestling to improve your Gracie Jiu-Jitsu game, defend take downs if you are a kickboxer or to get a head start or a step ahead for wrestling in high school, this class is for you. Former Pearl City High School head coach, Cedric Yogi is O2’s head wrestling instructor and is assisted by Stephen Thai, and Laura Obuhanych.
O2 rounded out its offerings by adding Kali-Escrima to our list of classes. These classes are instructed by Ian Beltran, a long time student of the late, legendary “Snookie” Sanchez. He will add to your hand to hand skills by teaching knife and stick fighting techniques, completing your well rounded martial arts education.
We do NOT have an enrollment period. Students are welcome to enroll at any time, even during the middle of the month! We will prorate your tuition if you decide to start in the middle of the month so that you get your money’s worth! You do not need to be in shape or have any experience at all. We specialize in teaching people with no training. Get in shape, learn self-defense, build self-confidence, meet great and friendly people at O2 Martial Arts Academy! Come to O2 where we help you reach your goals!
All of our classes are held at our main academy located at 98-019 Kamehameha Hwy Unit 208A, Aiea, HI 96701. Please email us at info@o2maa.com if you have any questions.