O2 Martial Arts Academy

O2 Martial Arts Academy

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The FIRST Relson Gracie Jiu-Jitsu Association Worldwide which features adult and children classes Come train under 8 Relson Gracie Black Belts under one roof.

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 THE FIRST Relson Gracie Jiu-Jitsu ASSOCIATION worldwide and part of the Relson Gracie Team. The Relson Gracie Jiu-Jitsu and Submission Wrestling classes are led by head instructors Chris (6th degree) and Mike Onzuka (7th degree), Kale

03/27/2026

To help raise funds for Todd Tanaka as he grapples with cancer, we are truly blessed to have two of the biggest names in Jiu-Jitsu that will participate in a fundraising seminar, Marcelo Garcia and Ryron Gracie!

Date: Sunday, April 19, 2026

Place: Japanese Cultural Center Bamboo Catering Ballroom 5th Flr
2454 S Beretania St., Honolulu, HI 96826

Time:
9:00-11:00 AM Marcelo Garcia (No Gi)
11:00-Noon Lunch Break
Acai bowls, food, and drinks will be sold as a fundraiser and so you do not have to go off site.
12:00-2:00 PM Ryron Gracie (Gi)

We are asking for a $100 donation to be paid directly to Todd by his venmo to reserve your spot.

https://venmo.com/u/T-O-dubL-D
Last 4 digits 1128
Please mention Tap Out Cancer Fundraiser in your notes

If you do not have venmo, please reach it to me, but we want funds to be directly sent to Todd for verification and security reasons so maybe you have a friend or teammate with venmo.

This seminar is open to all schools and practioners so please spread the word!

There are limited spots available so please jump on this incredible opportunity to learn from two legends and help one of the best humans fight and tap out cancer!

Work never stops for Pearl City’s multi-sport state champ Serah Yogi | Honolulu Star-Advertiser 01/07/2026

A great article about an incredible family! Congratulations to all the Yogis who were our neighbors in Palisades growing up and now my neighbor in Mililani. So glad that they are getting blessed with all this success and acknowledgement because they all deserve it!

https://www.staradvertiser.com/2026/01/06/sports/hawaii-prep-world/work-never-stops-for-pearl-citys-multi-sport-state-champ-serah-yogi/?HSA=1fab0956058a8dc06c4b7adc738e4ca3d79c7b13&fbclid=Iwb21leAPLC29leHRuA2FlbQIxMQBzcnRjBmFwcF9pZAwzNTA2ODU1MzE3MjgAAR7F47NUy7-OWFq0aWipTgI5Va-WGkSI20RbhBoUEVQdW3vT38Yb84ixG4TYig_aem_dGg00VPfdYXXpwrKLIT9gA

Work never stops for Pearl City’s multi-sport state champ Serah Yogi | Honolulu Star-Advertiser The titles and recognition are always nice.

Photos from O2 Martial Arts Academy's post 12/21/2025

O2.0 was completed today with the help on an army of extremely hard working individual putting in ton of man hours in this marathon day.

Thanks to everyone that helped us starting Wed with the receiving of the mat covering and vinyl (Bobby, Craig, Aiden, PJ, Andy). The pallet weighed 500lbs and the elevator was broken.

Friday night where we glued the wall mats to the plywood (Safe and Chad). Thanks to Chris S, Josiah, and Ian for covering my adults class so I could work on the mats.

Saturday included Josiah and his two sons in law, Safe, Craig, Ian, Matt, Scott, Andy and Drew (prior to catching a plane), Eric, Jay, Kameron, Travis and I hope I did not miss anyone.

We are so appreciative of everyone's sacrifice and hard work! There were so many man hours put in today with multiple crews working on a ton of projects simultaneously starting at noon otherwise we would not have finished by 10:30pm.

I think it came out incredible. I cannot wait until the team gets to see it in person. No more taping the mats which was my most hated academy task. I had a early morning soccer game for Damien at 9am (showed up at 8:15am) and then jetted over to O2 to start the work. I am so tired and sore, but it is so worth it. We are so blessed!

Photos from O2 Martial Arts Academy's post 12/02/2025

We wanted to share a huge moment in one of our brother's lives and he asked Maestro Ian Beltran who is a highly ranked officer to share this reenlistment event. Jayshawn is not only a beast on the mats, but a very positive person that is always willing to share his techniques and is a very smart young man who will be getting an electrical engineering degree soon. Congratulations Jayshawn!

From Ian, this is a monumental event for this young man and it was an honor that he asked me to swear him. I am asking him if it would be ok to share with the rest of O2, to show his service to the Nation, USAF, and the State of Hawaii. Super proud of this young man.

11/08/2025

Consistency and dedication are seen every Saturday morning by these savages!

www.o2maa.com for more info on joining the O2 family!

Photos from O2 Martial Arts Academy's post 10/15/2025

Chris is in Brazil for the Gracie 100 celebration and taught at Marcely's Relson Gracie Macae academy.

Photos from O2 Martial Arts Academy's post 10/02/2025

If you missed class Tuesday night, you missed out! Professor Kaleo Hosaka stopped in and taught some Judo and some passing the guard. He has been working crazy hours so it was a treat for him to come in and teach. He also popped in the day class with Professor Bobby on Monday. Don't miss these opportunities!

See you in class!

07/04/2025

O2 Martial Arts Academy is closed for the 4th of July on Friday, but our coaches will be opening up for a 9:00 a.m. open mat. Relson Gracie team members only.

Photos from O2 Martial Arts Academy's post 06/29/2025

Early Saturday morning rolls at O2 Martial Arts Academy!

Photos from O2 Martial Arts Academy's post 06/07/2025

Thanks to all that came to support the promotion of Craig and give him a "pat on the back" for years of dedication and for obtaining his black belt.

As most of you know, there are no fast track or short cuts for getting a black belt at O2 Martial Arts Academy which is why it is still a short list of those who obtained black belts with our team. You have to put in the time and pass the self defense test as you climb every rank or it is a no go. Most do not have the patience, humility, and dedication for the journey. Luckily the timing worked out so Craig was able to test with Grandmaster Relson for his black belt which is important for us to have our master confirm and approve his ex*****on of the test. Our students follow the path that Grandmaster Relson taught us.

Craig is a perfect example of a hard working, dedicated, and selfless student and instructor who is always very generous with his time and is constantly helping others get better and share his knowledge. He is a major asset to O2 and we could not be more proud of him.

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Location

Telephone

Address

98-019 Kamehameha Highway Unit 208A
Aiea, HI
96701

Opening Hours

Monday 11am - 12pm
5:30pm - 8:10pm
Tuesday 6:30pm - 8:10pm
Wednesday 5pm - 7:40pm
Thursday 5pm - 8:10pm
Friday 11am - 12pm
5:30pm - 8:10pm
Saturday 7am - 7:40am
5pm - 5:40pm
Sunday 3pm - 6pm