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Welcome to Sigma Martial Arts & Fitness

Where Strength, Confidence, and Community Come Together

At Sigma Martial Arts & Fitness, we believe in letting you experience our classes firsthand. That’s why we offer free trial classes for all of our programs. Whether you're new to martial arts or an experienced practitioner, we welcome you to try us and see why we’re the top choice for martial arts in the Boston metro area.

If you’d like to schedule a one-on-one private class, please reach out to the Sigma team directly by clicking here.

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Looking for a way to get fit, learn self-defense, and build lasting confidence? Whether you're an adult seeking a challenging workout or a parent looking for a fun, enriching activity for your child, Sigma Martial Arts & Fitness in the Boston metro area has the perfect program for you.

Why Choose Sigma Martial Arts & Fitness?

  • Expert Instructors: Our highly trained, professional instructors are experts in their fields, offering personalized guidance to help you succeed, no matter your starting point.

  • Programs for All Ages: We offer programs for adults, teens, children, and even preschoolers, so the whole family can get involved.

  • Clean, Modern Studio: Train in a safe, welcoming environment equipped with the latest facilities and a focus on hygiene.

  • Blackbelt Mindset and Leadership Academies: For kids and teens, our unique character development programs instill essential life skills like discipline, focus, and leadership.

  • Fitness & Self-Defense: Our programs are designed to improve physical fitness, build strength, and teach practical self-defense skills that can be used in everyday life.

Programs We Offer:

  • Brazilian Jiu-Jitsu (BJJ): Master the art of leverage and technique with our world-class BJJ program, designed for all skill levels.

  • Kickboxing: Get fit fast with high-energy kickboxing classes that combine cardio, strength, and self-defense.

  • Judo: Learn throws, grappling, and submission techniques in a disciplined yet supportive environment.

  • Muay Thai: Master the art of eight limbs, combining punches, kicks, elbows, and knees for an intense workout.

  • Mixed Martial Arts (MMA): Train like a pro with a blend of striking and grappling techniques, perfect for those looking to challenge themselves.

  • Children’s and Teen Programs: Build confidence, focus, and discipline while learning martial arts in a fun, structured environment.

Ready to Get Started? Sign up for your free trial class today and take the first step!

What People Are Saying

  • This is a great place to learn karate for children the instructors have a lot a patience and they are also very professional and still make It fun for kids.

    Ana Maria L.

  • This is an awesome martial arts studio. The owner runs a clean operation, and the instruction is top notch. The dojo is well appointed with safety padding on floors and pillars, and has floor to ceiling mirrors to check your form during classes. I hope all aspiring martial arts students and aficionados alike take note of this hidden gem!

    Vambah S.

  • This place is the best! They have a balanced mix of traditional and practical martial arts training. Their classes are always fun, informative and a great workout!

    Mickey T.

  • Amazing coach, clean facility, nice and fun learning environment. Basically the best Muay Thai practice I ever had! Strongly recommended!!!!!

    Kaofang N.

  • Was extremely impressed with how clean the dojo was! The Judo Instructor Sensei Mo was very friendly welcoming and knowledgeable. Cant wait to go back.

    Tony D.

  • Very clean, spacious, and a great selection of gear to use.

    Joshua C.

  • I've been going here for almost a whole year, and I absolutely love the place. It's welcoming, fun, clean, and a great workout! The instructors are friendly and kind, they offer a lot of different classes, and it's great for both kids and adults. To me, it's a perfect middle ground between the extremes of super hardcore bro gyms that focus only on competition, and flakey programs that give you exercise but no real martial arts training.

    Alison E.


  • Impressive place. Clean, organized and professional. The instructors are seasoned professionals and everything is at your own pace. All skills levels. Everyone just super nice and supportive. And awesome workout!

    William B.

  • I started out doing adult martial arts, but liked the school and the style so much I have now also taken up Muay Thai. Both classes are a lot of fun. I am learning something new every time, and I’ve become much stronger (no more back pain, hurray!). For the quality of instruction, number of opportunities to train throughout the week and individual attention you get it’s really very good value for money. I cannot recommend this place enough!

    Lauren D.

  • This is a great addition to Medford. The studio is clean and the instructors are phenomenal. There's a great sense of community and the atmosphere is welcoming for anyone who is new or has experience in martial arts, kickboxing, or mauy thai. Since joining the studio, I have been recommending it to my friends since I'm always learning so much here and growing my skills in martial arts.em

    Kristina B.

  • As a new student to martial arts I really appreciate their attention to detail, stories about their previous experiences and of course getting in a good workout! I have had nothing but a great experience and look forward to many more classes. If you are considering starting martial arts or just want a good workout in a positive setting, I highly recommend Sigma.

    Jessica R.

Join Our Community – Try a Free Class Now!