JUDO AND JIUJITSU CLASSES IN SAN LEANDRO

WHAT WE DO

510 Judo provides high quality instruction in judo, Brazilian jiujitsu and wrestling in the city of San Leandro, serving all the surrounding bay area. We are located in the Estudillo Estates area of San Leandro, just off the 580 and less than two miles from the San Leandro BART station. We offer classes for both kids and adults. Judo is great for keeping in shape, self-defense and body awareness. It’s also incredibly fun. Come join us!

  • Have fun

  • Learn a skill

  • Get in shape

martial arts

MEET OUR BLACK BELTS

Most black belt portraits by Angela Lang Photography.

Jonah Ewell
Jonah EwellSensei & Head Instructor
Sensei Jonah started training at eight years old with Dr. Alex Feng, learning judo and kung fu. He received his black belt shortly after high school and currently holds the rank of sandan (third degree black belt). He wrestled in high school and also has experience with kickboxing, boxing, and tae kwon do. He also has a purple belt in Brazilian jiujitsu under Omar Kasdi, affiliated with Rio Combat Team and Team Carlson Gracie.

Sensei Jonah is a former two-time national champion in the M3 (40-44) age category.

“Judo is three different things: a martial art for self defense and self improvement, a sport, and a fun way to spend time with friends. It’s my goal at 510 Judo to provide an environment where people can experience judo in all these ways.” -Sensei Jonah

Certifications:
-National Level Coach
-Local Referee
-Heads Up concussion safety
-SafeSport

Cody Costello
Cody CostelloSensei
Sensei Cody Costello is a wonderful teacher for both kids and adults. He received his black belt from Sensei Gordon Makimoto at the Vacaville P.A.L. and is a former junior national champion. He earned a blue belt in Brazilian jiujitsu from Fabio Prado.

Sensei Cody also teaches at Griffin Performance Judo in El Cerrito.

Certifications:
-Safesport
-Heads Up concussion safety

Alex Feng
Alex FengSensei Emeritus
Dr. Alex Feng received his black belt at age nineteen in judo and jujitsu. He holds a second-degree black belt in Kodenkan jujitsu and a fourth-degree black belt in judo. Dr. Feng has trained with such legends as Wally Jay and Keiko Fukuda. In 1967, he was the American Judo & Jujitsu Federation national heavyweight champion in Judo.
Omar Kasdi
Omar KasdiSensei and Head of Brazilian Jiujitsu
Sensei Omar is a first degree black belt in Brazilian jiujitsu and head coach at Catch MMA in Oakland. In 2019 he was a silver medalist at the IBJJF No Gi World Championships.
Alan Aki
Alan AkiSensei
Alan Aki grew up in Berkeley and started taking judo at age 12 with Tone Shimizu and Mike Grunwald at To Bay Dojo. He continued training and competing throughout high school and college. He and his wife perform with the Mahea Uchiyama Center for International Dance in Berkeley. Alan primarily plays the toere (Tahitian log drum) and ‘ukuleles (both Hawaiian and Tahitian) and has appeared on a few of Kumu Mahea’s cds, while his wife dances. They also have two young children who they hope will take up both hobbies.
Mark Harmon
Mark HarmonSensei
Mark grew up on the peninsula south of San Francisco and received his brown belt from judo legend Willy Cahill. After a long period away from judo, he joined Oakland Judo in 2013 and received his first degree black belt shortly thereafter. He is also a purple belt in Brazilian jiujitsu under Omar Kasdi, affiliated with Rio Combat team. Mark is interested in old-school judo techniques such as leg locks.
Leon Kenin
Leon KeninSensei Emeritus
Leon grew up in Berkeley where he began learning judo at age eight with Dr. Feng. He has competed in California at the youth level, at the national collegiate level as a member of the Princeton Judo Team, and internationally at the adult level. Sensei Leon founded and ran a Judo school in Jerusalem, Israel. He also founded the youth Judo program at the Downtown Berkeley YMCA, as well as running Kenin Kan Judo Club.
Ivan Mumm
Ivan MummSensei
Sensei Ivan’s relentless positive attitude is a welcome addition to our practices. He is a two-time national champion in the M4 age category and placed 5th in the world at the 2018 Veterans World Championships.
Chris Moulton
Chris Moulton Sensei Emeritus
Chris received his black belt from Sensei John Bertsch at UC Berkeley in 2017. During that year he accumulated enough ranking points in the -90kg category to earn a spot competing internationally for Team USA, and after that represented the U.S. on the IJF tour in Peru, Columbia, and Tunisia.

In 2019 Chris took bronze at the USA Judo Senior Nationals in the -90kg Senior Elite division.

In 2020 Sensei Chris moved out of the area. It was a pleasure to have Chris practice with us here at 510 Judo.

Minobu Shibuya
Minobu ShibuyaHome Dojo: City College of San Francisco
Minobu Sensei started judo as an adult and received her black belt in 2013. She is a National Level Referee and you will often see her donating her time and expertise at judo tournaments. In her spare time enjoys dancing salsa and samba.

Her son Yoshiki is a black belt at East Bay Judo Institute in El Cerrito.

Kokou Katamani
Kokou KatamaniSensei
Kokou is originally from the country of Togo in West Africa. As a young man he took up karate and boxing, but quickly fell in love with judo. He has trained in France as well as in Washington D.C. with Sensei Jimmy Takemori. In 2018, at age 57, Kokou earned his first degree black belt. His son Kofi is a member of the 510 Judo competition team.

FREQUENTLY ASKED QUESTIONS

Judo is a martial art and Olympic sport that uses throws, holds and submissions. It is excellent for self defense, a great workout, and a lot of fun!

Brazilian Jiujitsu (BJJ) is a method of fighting and self defense without weapons. It’s very similar to judo – the uniform is the same, the belt system is similar, many of the techniques overlap. Where BJJ differs is in the emphasis on ground techniques. Generally speaking BJJ focuses about 80/20 on groundwork to standing techniques, whereas judo is the inverse at about 80/20 throws and takedowns to finishing techniques on the ground. This is of course a generalization – individual schools and instructors all have their own style.

BJJ and judo work very well together! You are encouraged to train both.

Yes! Although accidents can happen in any physical endeavor, at 510 Judo we create a culture of respect and safety. You have to look out for your training partners and treat them well, or soon you’ll find yourself without anyone to practice with.

One of the very first things a new student learns is how to fall properly – there is a technique to it! Once you learn the technique of falling and get comfortable with it, you will lose your fear of falling and start to progress very quickly.

Judo and wrestling are closely related. They both fall under the umbrella of “grappling” meaning a way of fighting without striking – no punching or kicking is allowed. They are both Olympic sports with millions and perhaps billions of participants worldwide in all age groups. The main differences fall into three categories: uniform, application of sport rules, and philosophy.

A judo uniform consists of a thick cotton jacket and pants, and a colored belt indicating your rank. No shoes are worn. This uniform is worn in practice and in competition, and the only colors allowed are white and blue. In wrestling competition one usually wears a wrestling singlet, a one piece item that allows maximum maneuverability, as well as special wrestling shoes, and sometimes headgear is worn to protect the ears. In wrestling practice people usually wear sweatpants and a t-shirt with their wrestling shoes, and sometimes a sweatshirt if the weather is cold.

In judo, you must attempt to throw your opponent flat on their back – if you can do this with force and control, you will be awarded ippon by the referee, an instant win. The jacket and belt are used to throw your opponent, so the game of fighting for grips is of crucial importance. You can also win by pin or a submission such as a choke or armbar. Since 2010, you are not allowed to grab the pants or anywhere below the belt for the purpose of throwing your opponent.

In American folkstyle wrestling, the objective is to take down and control your opponent and pin them by putting both shoulder blades on the mat for two seconds. Grabbing the uniform is not allowed, so wrestlers learn to control their opponents by holding and throwing them by the wrist, head, shoulder, legs, waist, ankle – anywhere you can get a grip. You are not required to throw them on their back – as long as they fall down and you retain control, that’s all that matters.

Judo’s two mottoes are seiryoku zenyo and jita kyoei, meaning “maximum efficiency, minimum effort” and “mutual welfare and benefit” respectively. The first refers to the efficient use of body mechanics and the preservation of energy, while the second refers to the idea that judo can be used to benefit everyone – participants and society at large. Dr. Jigoro Kano, the inventor of judo, was an educator and dedicated to the idea that judo could be used to produce good people and good citizens.

Wrestling rewards hard work and intensity more than any other sport. As a sport with weight divisions, athletes of any size can participate and rise to the top. As a wrestler, your child will learn that they can accomplish anything with the right attitude.

Yes! In fact we encourage it. Judo will make you a better wrestler, and wrestling will make you a better judoka. All wrestling and kid’s judo classes are included with a Youth Membership.

You can buy a 510 Judo branded uniform (judogi) from us, or you can just search “judo uniform” on the internet. They even sell them on Amazon these days.

Modern sport judo is an amazing, fast paced activity that develops timing, strength, balance, and coordination. However, as an Olympic sport, it is subject to frequent rule changes and tweaks, designed to make judo more friendly to the average television viewer. Some of these rule changes are detrimental to judo as a practical martial art for self defense. Most notably, the 2010 ban on grabbing the legs eliminated a large set of useful techniques.

Although we pay attention to both sport and non-sport applications in all classes, on Monday nights we specifically ignore most of the modern sport rules – as long as we can practice a technique safely, it’s allowed. This approach to judo is very satisfying – after all, saying “hey that’s not allowed!” is not a useful self defense technique!

Just that – judo done without a gi. Just wear comfortable workout clothes – a rashguard and fight shorts are also great for maximum maneuverability. Without a thick jacket to grab on to, you will learn to use various body parts as your handles. This class incorporates some of the most useful techniques from wrestling and jiujitsu for a more complete fighting system.