D-1 & Only Martial Arts

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.

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 @
. Or you can call them at: (925) 753‑1167.

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 :)

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 for both me and my daughter. My daughter is now a black belt and is going for her second degree. We couldn’t be any happier with the decision that we’ve made in regards to enrolling our daughter in this school. The friends that she’s made while attending Delta 1 Martial Arts are friends that we not only associate while in school, but also outside of the karate school. The parents that we’ve met through our daughter are now our friends and now they’ll be friends that we’ll have for a very long time. I’ve seen these kids grow up with my daughter. I’ve grown to admire Tim and Tammy Calvin as owners and I’m honored to call them our friends. Keep up the great work.!! 2 thumbs up for Delta 1 Martial Arts.

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.

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 dojo — I am there in the moment and the world melts away.
Do not get me wrong. Training is not a cake walk, it is rigorous especially as you move up in rank but is fun and rewarding.
Sifu Tim and the other instructors care about the art and form. They take the time to teach you what proper technique and explain the purpose of each move and even teach you one on one.
Sifu Tim, Ms Tammy and et al. are family-​centric. They not only care about the art but about the student (whether adult or child). They are involved in building up the confidence levels of students by participating in mentoring programs, group outings, and giving back to the communities.
I LOVE THIS PLACE!

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.