D-1 & Only Martial Arts
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D-1 & Only Martial Arts
At Split-Second Response Martial Art, we're committed to providing an individualized experience for each and every person who walks through our doors. We're building young students up with tailored martial arts training, professional character development, and a focus on helping our students find success for all aspects of life.

Our adult training is the perfect blend of fitness, self-defense, and incredible support. We're helping people of all fitness levels stay active and have fun challenging themselves. We offer weapons-based self-defense, real-world training strategies, and hands-on coaching every step of the way. We signed our daughter up to D1 & Only Martial Arts after she was hit by another student at school.
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At Split-Second Response Martial Arts, our Kids Martial Arts classes are setting students across our community up for success. We're using the world of martial arts to help students challenge themselves, learn effective self-defense skills, and build the essential character development tools they'll need to thrive in all aspects of life.
Are you looking for the best way to combine fitness, self-defense, and incredible support throughout your training routine? Well, at Split-Second Response Martial Arts, we have the answer. Our Teen and Adult Martial Arts classes are the best way for teens and adults to learn effective martial arts movements and get the most out of every workout.
At Split-Second Response Martial Arts, we spend a lot of our time focused on developing young athletes and teaching traditional martial arts skills. But we also recognize that success in life isn't based on how strong you are or how well you can defend yourself. That's why we're proud to offer a comprehensive Life Skills program that sets young people across our community up for success.
School's out and it's time to keep your kids active by signing them up for Summer Camp at Split-Second Response Martial Arts. We provide fun, engaging and exciting Martial Arts Summer Camps for kids of all ages in Antioch.

Not only will your child learn cool new Martial Arts moves, they will also go on exciting weekly outings, review academics for next school year with local elementary teacher, Ms. Deanna Anderson, and they will learn about cool Martial Arts weapons such as Philippine Arnis and Nunchaku.We understand that summer is a busy season for everyone and we want to make it easy for your children to enjoy as much of our programs as possible!
We signed our daughter up to D1 & Only Martial Arts after she was hit by another student at school. We wanted her to know how to be able to protect herself. We liked it so much that we enrolled all our kids. It has been a great experience for them all. They love coming to class and learning new skills and are also held accountable for their own behavior.
Reviews (16)
Tom J.
Tom J.
Sep 15, 2020
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My son Ty , 13 yrs old, tried his first class at D-1 yesterday and I was impressed. Not intimidating at all . All instructors were able to cue in on my son's challanges and help him move forward without embarassing him or making him feel inferior. Even though others were present instructors took the time to show him the correct way without singling him out. This was impressive to me because many times students get lost in numbers. Another element that stood out was respect. Not just at a martial arts level, but truely sincere level of respect towards others.

Great first impression!
Jeanette S.
Jeanette S.
Jul 23, 2019
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My grandson attend the D1 & Only Martial Arts. He enjoys his class when he's there and looks forward to going to class. The staff and the instructors are wonderful. One thing I really like about the center, they are very concerned about the well-being of the child education. And you have forms to fill out and the child teacher to fill out as well. There are consequences for the child if he's not doing well at school or home. This is a great learning experience for the child and it makes one confident and responsible. I would recommend anyone, even you!
Guillermo P.
Guillermo P.
Jun 20, 2019
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This place is too small for the amount of kids that go there. The student to teacher ratio is way too high. It also seems that they are only interested in having the kids bring in more kids or family and fiends. It's one big money grab to me , it should be about the kids but it's not.
Jillian S.
Jillian S.
Jun 05, 2019
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This is seriously the best place ever! I couldn't be more happy with the program down there! The way they are with children, they make every person and child down there feel special! Everything is very family oriented. And I just cannot believe the results I've been seeing in my own child!! I would highly suggest D1 and only martial arts. 5 stars for sure!!!
Toni P.
Toni P.
Apr 13, 2017
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I feel so lucky to have found D-1. I love it! The Calvin's are amazing. Sifu Tim, Sifu Jarell and Sifu Isaiah are awesome instructors.
I am at awe when I watch them with children. They really understand them and the kids are all smiles when they are there. My daughter loves it. I'm grateful that not only is she learning martial arts, but is learning about respect and is acquiring better listening skills.
I started over a year ago and it has changed my life. They really break down the combinations we learn during class so you can understand them. Sifu Tim was in the Marines and was a Police
Alison D.
Alison D.
Mar 29, 2017
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I can't say enough good things about this place. They are great with kids and are always having special events for the children and adults. Very reasonably priced for the amount of time they put into teaching your kids. Tempted to takes classes myself, if only there were more time in a week.
Susan T.
Susan T.
Dec 03, 2016
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My family and I started here over 10 years ago. Now, me, my husband, my son, my daughter, my nephew, my niece, and my brother-in-law have all earned at least one black belt each (some of us have 2 or 3 degrees, even!). This school is our home away from home. The Master Instructor, Sifu Tim Calvin, is an amazing teacher. He is patient with kids and adults alike, but firm. His son, Chief Instructor Sifu Jarrell Calvin, has followed in his father's footsteps and has become a great instructor as well. They teach practical martial arts (Kajukenbo, kickboxing, grappling, and more) and focus
Laura O.
Laura O.
Sep 29, 2016
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Beware of this place. I signed my son up for karate and due to my schedule and his lack of interest I notified them that I wanted to cancel. They said they needed 30 days so I didn't have any issue paying August. I was charged for September when we repeatedly told them please cancel. I have been going back and forth have had to cancel my card and disputed the charges and they say I owe for October. For a place that works off of referrals and word of mouth this is very poor service. I will never be going back and any of my sons friends ask about going to karate I will tell them do not
Jasmynne B.
Jasmynne B.
Jun 29, 2016
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We've been at D1 for a year and a half now. My son's first class, I was quite impressed. From the shaking of hands to how they earn their belts. He definitely enjoys being a part of this school and I've seen a different side to him. He, along with all students, receive honest constrictive criticism and honest feedback. Truly appreciate the whole team! Miss Tammy, Miss Vicki, sifu Tim, sifu Jarell and all black belt instructors...thanks!!!
Judy M.
Judy M.
Oct 01, 2015
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I cannot say enough good things about D1. We definitely feel that we made the right decision in bringing our teenage daughter to this school. She learned discipline and developed focus from attending her classes, her new motto is "never give up." The best part is that Sifu Tim, Miss Tammy and all the instructors genuinely care about the character and moral development of their students. The instructors and students look after each other like family. I don't think we can find another martial arts school like D1 and Only, they truly live up to their name.
Eriq H.
Eriq H.
Sep 16, 2014
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Looking for a great place for you or your child/children to take Karate/Self Defense??? There is a great place in Antioch called "D-1 & Only Martial Arts" Academy, Inc.

They feature anti-bullying, women's self-defense, children's ID cards, etc. They are especially great with everyone, especially children.

They are the nicest, most respectful teachers, and they teach their students to have the same respect for everyone.

For more information, you may check out their website @ http://www.deltaoneinc.com. Or you can call them at: (925) 753-1167.
Sydara P.
Sydara P.
Mar 18, 2014
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I am so happy my coworker told me abt this place. The Sifus (instructors) r fantastic!! They're obviously very skilled in the art and r passionate abt teaching and interacting with all the kids. I haven't stopped smiling since I stepped thru the doors bc the environment is super welcoming and the kids of all ages just love being here :)
Joseph C.
Joseph C.
Sep 12, 2012
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I first met Sifu Tim and Tammy when we enrolled our daughter at Delta 1 when she was 4 years old. I was pleasantly surprised with the class. I found the environment very family oriented and non threatening. The staff at the school is very professional. They answered any and all question with regards to my daughter. They've also addressed any issues in a timely manner. Sifu Tim has very strong work ethics and he instills these beliefs in his staff and also in his teachings. Over the past 8 years, I've attended a few classes with Sifu Tim and have found his teaching very motivating
Ruthann M.
Ruthann M.
Sep 13, 2011
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I went here last year and took part in the Keepin it Real class. Its a great class for exercise and learning self-defense. The experience I had was invaluable and Tammy and Sifu Tim were incredibly nice people.
Deanna J.
Deanna J.
Dec 15, 2010
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First, I want to apologize because I should have reviewed this place a very long time ago!

I have trained at this location for at least the last 6 years.

I remember the first time I had to stop attending classes because I was moving. I had asked Sifu Tim if he could recommend another kaju school in the area I was moving to and he was very gracious about it.

What I realized is I could not (and still cannot) bring myself to train elsewhere. Ms. Tammy and Sifu Tim are ohana and they foster an environment which has become a haven for me and provides a sense of well being. When I walk into the
Ashley P.
Ashley P.
Oct 23, 2010
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This is such a great martial arts studio. The atmosphere is amazing, the staff is extremely friendly and knowledgeable, and I love how they seem to give each child personal attention, even with the large size of their classes. The location is great. My nephew is 3-years-old, and has at least 2 instructors personally helping him each class until he catches on. He seems so comfortable and LOVES everything about karate now. They are flexible pay-wise, if you cannot afford their monthly rates. I would recommend this studio to anyone interested in martial arts.