About
510 Judo Youth Program offers instruction in judo, jujitsu, Brazilian jiujitsu, wrestling, Old School Judo, No Gi Judo, and self defense. The program includes options that use traditional uniforms as well as No Gi Judo classes that incorporate techniques from wrestling and jiujitsu. All wrestling and kids’ judo classes are included with a Youth Membership.
• Ages: 5–18 years old
510 Judo Youth Program is part of 510 Judo, which has been in operation since at least 2012. The program states that it provides high quality instruction in judo and jujitsu in the city of San Leandro, serving the surrounding Bay Area, and describes judo as great for keeping in shape, self-defense and body awareness, and as incredibly fun.
The leadership team includes Sensei and Head Instructor David Quinonez, Sensei Nico Harriman, Sensei Alan Aki, and Sempai Aleka Aquinonez. David Quinonez holds a 4th Dan in Kodokan Judo, an 8th Dan in Small Circle Judo and Jujitsu, a 1st Dan in Kokoshin Judo, and a 2nd Dan in Danzan Ryu Jujitsu, and he has multiple medals from World Masters, Collegiate Nationals, and High School National competitions, as well as the Professor Yamaouchi award for sportsmanship. Nico Harriman received his black belt from Sensei Dave Quinones of Bay Isle Judo in Alameda, California, and competed for the San Jose State University judo team. Alan Aki started judo at age 12 at To Bay Dojo with Tone Shimizu and Mike Grunwald and continued training and competing through high school and college. Jonah is described in testimonials as a recent national champ in Judo, and Omar is described as competing in the pro Brazilian Jiu-Jitsu circuit.
The program offers a free trial class. It has programs for both kids and adults, and competitions are held throughout the year in the Bay Area. 510 Judo branded uniforms (judogi) are available for purchase, and students can also search for a judo uniform online. For No Gi Judo, students are instructed to wear comfortable workout clothes, with a rashguard and fight shorts recommended for maneuverability. The dojo emphasizes a culture of respect and safety with a focus on learning how to fall properly. There is a Monday night Old School Judo class that ignores most modern sport rules as long as techniques can be practiced safely, and a No Gi Judo class that incorporates techniques from wrestling and jiujitsu. The training space uses a floating floor with foam Dollamur judo mats on a custom “Denver floating floor” subfloor.
510 Judo hosted the 2nd Bay Area Judo Championships in 2024 at Pinole Valley High School. Testimonials describe the dojo as awesome and welcoming, and describe classes as fun, informative, and gripping, with praise for Sensei Jonah’s patient teaching style and for the way lessons in class apply to many things in life. Multiple testimonials from long-time martial artists state that Sensei Jonah is one of the best martial arts teachers they have had and express respect for the grappling instruction from Jonah and Omar, mentioning a thriving kids’ class and that Jonah teaches all ages.
Last updated March 22, 2026.
• Ages: 5–18 years old
510 Judo Youth Program is part of 510 Judo, which has been in operation since at least 2012. The program states that it provides high quality instruction in judo and jujitsu in the city of San Leandro, serving the surrounding Bay Area, and describes judo as great for keeping in shape, self-defense and body awareness, and as incredibly fun.
The leadership team includes Sensei and Head Instructor David Quinonez, Sensei Nico Harriman, Sensei Alan Aki, and Sempai Aleka Aquinonez. David Quinonez holds a 4th Dan in Kodokan Judo, an 8th Dan in Small Circle Judo and Jujitsu, a 1st Dan in Kokoshin Judo, and a 2nd Dan in Danzan Ryu Jujitsu, and he has multiple medals from World Masters, Collegiate Nationals, and High School National competitions, as well as the Professor Yamaouchi award for sportsmanship. Nico Harriman received his black belt from Sensei Dave Quinones of Bay Isle Judo in Alameda, California, and competed for the San Jose State University judo team. Alan Aki started judo at age 12 at To Bay Dojo with Tone Shimizu and Mike Grunwald and continued training and competing through high school and college. Jonah is described in testimonials as a recent national champ in Judo, and Omar is described as competing in the pro Brazilian Jiu-Jitsu circuit.
The program offers a free trial class. It has programs for both kids and adults, and competitions are held throughout the year in the Bay Area. 510 Judo branded uniforms (judogi) are available for purchase, and students can also search for a judo uniform online. For No Gi Judo, students are instructed to wear comfortable workout clothes, with a rashguard and fight shorts recommended for maneuverability. The dojo emphasizes a culture of respect and safety with a focus on learning how to fall properly. There is a Monday night Old School Judo class that ignores most modern sport rules as long as techniques can be practiced safely, and a No Gi Judo class that incorporates techniques from wrestling and jiujitsu. The training space uses a floating floor with foam Dollamur judo mats on a custom “Denver floating floor” subfloor.
510 Judo hosted the 2nd Bay Area Judo Championships in 2024 at Pinole Valley High School. Testimonials describe the dojo as awesome and welcoming, and describe classes as fun, informative, and gripping, with praise for Sensei Jonah’s patient teaching style and for the way lessons in class apply to many things in life. Multiple testimonials from long-time martial artists state that Sensei Jonah is one of the best martial arts teachers they have had and express respect for the grappling instruction from Jonah and Omar, mentioning a thriving kids’ class and that Jonah teaches all ages.
Last updated March 22, 2026.
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