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UndergrounD Fitness and Self Defense
5 ★★★★★ 46 Google reviews · Taekwondo school in Jacksonville, Florida
Plan your first class
- Free trial or intro class most schools welcome new students with a free trial or intro class — check their site or give them a call to book your first session
- Kids & teens classes kids and teens taekwondo classes (ages 3–13) — built around discipline, focus, confidence, and anti-bully skills
- Beginner-friendly all ages and levels welcome, including total beginners — you don't need to be fit or have any experience to start
- Private lessons private, one-on-one instruction available — a focused way to start or to work around a busy schedule; ask about availability and rates
- Today see hours ·
- Website & schedule underground-training.com — book classes and see the live schedule
- Phone (904) 704-7888
Hours
| Monday | 12–8 PM |
| Tuesday | 12–8 PM |
| Wednesday | 12–8 PM |
| Thursday | 12–8 PM |
| Friday | 12–4 PM |
| Saturday | 9:30 AM–12:30 PM |
| Sunday | Closed |
The classes they run
“As a parent, I have always dreamed of finding a space where my son would not only feel recognized but also fully embraced, and still learn the value of discipline.”
“They also offer personal one on one sessions, a fun ninja night night for kids so parents can go out for a “date night”.”
“Last Saturday was a day we'll cherish forever - a thrilling experience at Underground Fitness and Self Defense's karate belt testing held at the picturesque Alimacani Park.”
“Last Saturday was a day we'll cherish forever - a thrilling experience at Underground Fitness and Self Defense's karate belt testing held at the picturesque Alimacani Park.”
Other martial arts here
“Last Saturday was a day we'll cherish forever - a thrilling experience at Underground Fitness and Self Defense's karate belt testing held at the picturesque Alimacani Park.”
“I did BJJ here also, but coach Cliff has his own dojo now.”
“We love being a part of the judo family at underground!”
“Last Saturday was a day we'll cherish forever - a thrilling experience at Underground Fitness and Self Defense's karate belt testing held at the picturesque Alimacani Park.”
What students say
“Master Ben & master Williams are incredibly knowledgeable, patient, and motivating.”
“From the very first day, Master Benjamin and Master Williams welcomed us with open arms, creating an atmosphere that feels both supportive and structured.”
“I wanted him to learn self defense and some form of martial arts to build his confidence despite his challenges.”
“They'll bring out your child's full potential, even if your child isn't feeling very confident about themselves.”
“As a parent, I have always dreamed of finding a space where my son would not only feel recognized but also fully embraced, and still learn the value of discipline.”
“My son , 3 , looks forward to his Minja class and I love that fact the he has a structured class in which he has fun, learns about self control, and makes new friends.”
From the reviews
My daughter has been going for almost a year now, since she was 5 years old. She has learned so much and we appreciate Master LaMaster’s and Master William’s patience and support with our busy little girl. She loves parent night out and is super excited for camp!
We love being a part of the judo family at underground!! Awesome and fun times growing and learning too!! Definitely awesome experience!! The instructors are friendly nice and amazing!! We love it!!
Last Saturday was a day we'll cherish forever - a thrilling experience at Underground Fitness and Self Defense's karate belt testing held at the picturesque Alimacani Park. My son, Trip, and I were immersed in a whirlwind of excitement that included paddle boarding, running, swimming, and, of course, plenty of fun!
My son has been attending underground fitness for over a year and absolutely loves it! Master Ben and Williams are fantastic with the kids, patient, teach respect, build up confidence, and provide a great positive outlet for my energetic kiddo.
New to taekwondo? Start at UndergrounD Fitness and Self Defense
UndergrounD Fitness and Self Defense comes up as a beginner-friendly school, going by their listing and students’ reviews. If you've never trained or set foot in a dojang, that's exactly who a good beginners program is for. A few things worth knowing before your first week. First, you don't need to be fit or flexible to start — you get in shape by training, not before it, and instructors scale the intensity to you. Second, you won't be thrown into hard sparring — reputable schools build fundamentals (stances, blocks, kicks, and basic forms) for weeks, sparring eases in gradually and with gear on, and instructors keep it controlled and safe. Third, all ages and all levels really are welcome — ask about a dedicated beginners or fundamentals class time so your first session is alongside others who are also starting out. Most schools are happy to let you watch or try a class first, so reach out before you commit.
Your first taekwondo class at UndergrounD Fitness and Self Defense
Nervous about walking into a taekwondo school for the first time? Almost everyone is, and good instructors expect beginners to come through the door. Here's what to know. What to expect: a typical first class is a warm-up, then drilling basic stances, blocks, and kicks with a partner or on pads — not hard sparring. Rest whenever you need to; no one will bat an eye. What to wear: loose athletic wear you can move in (or a dobok if you have one); you'll train barefoot on the floor. What to bring: water and a positive attitude — many schools lend a loaner dobok for a first class, so it's worth asking when you call. As you keep training you'll get your own dobok and belt, and sparring gear (mouthguard, headgear, and guards) once you begin sparring. Sparring eases in gradually, once your fundamentals and forms are solid. Arrive 10–15 minutes early to sign a waiver and meet the instructor. It gets easier fast — most people feel far more at home by their third class.
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