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Sigma Martial Arts & Fitness
4.7 ★★★★★ 56 Google reviews · Muay thai gym in Medford, Massachusetts
Authentic Thai — reviews and the gym's own info point to coaching rooted in Thailand's muay thai tradition. If lineage matters to you, ask where the coaches trained and about their kru.
Plan your first class
- Free trial or intro class most gyms welcome new members with a free trial or intro class — check their site or give them a call to book your first session
- Beginner-friendly all levels welcome, including total beginners — you don't need to be fit or have any experience to start
- Kids & youth classes kids and youth muay thai classes — built around discipline, focus, and confidence
- Fitness & conditioning muay thai fitness and cardio classes — a serious workout you can do without ever having to spar
- Today see hours ·
- Website & schedule sigma-ma.com — book classes and see the live schedule
- Phone (857) 997-0770
Hours
| Monday | 10:30 AM–8:30 PM |
| Tuesday | 10:30 AM–8:30 PM |
| Wednesday | 10:30 AM–8:30 PM |
| Thursday | 10:30 AM–8:30 PM |
| Friday | 2–6 PM |
| Saturday | 9 AM–1:30 PM |
| Sunday | Closed |
The classes they run
“Whether you’re a beginner or experienced, this place is perfect for building strength, confidence, and skill.”
“My son (7 years old) has been in the aftercare program at Sigma since the start of the 2nd grade and absolutely loves it.”
“I followed suit and have myself been taking kick boxing classes which have been a great workout and tons of fun for me as well.”
Other martial arts here
“Started off going to the adult kickboxing classes with no prior experience and eventually transitioned into the Adult Muay Thai classes.”
“I followed suit and have myself been taking kick boxing classes which have been a great workout and tons of fun for me as well.”
“I’ve been training Jiu Jitsu at Sigma for almost a year now, and it’s been an amazing experience!”
“Great karate studio for beginners and the experienced clients alike!”
What members say
“I've tried several other martial arts schools, but none were as welcoming, friendly, and willing to work with my personal skill level and needs as Sigma.”
“I've tried several other martial arts schools, but none were as welcoming, friendly, and willing to work with my personal skill level and needs as Sigma.”
“The night after his first class, he put on his uniform back on and showed us everything he learned.”
“I followed suit and have myself been taking kick boxing classes which have been a great workout and tons of fun for me as well.”
“All of the instructors are amazing and my daughter has fallen in love with martial arts.”
“Aside from keeping our kids physically active, I appreciate that they teach important concepts like discipline, gratitude and humility.”
From the reviews
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.
Update on May 2022. They also have super awesome kids program. My daughter trains with Sensei Tim today and she loves the class. Come sign up!! Joined Sigma since day 1. My whole family have been trained with Sensei Tim for years. He is extremely knowledgeable in many different martial art techniques.
Very family friendly. Practical skills are taught here. Instructors break everything down so that learning is both fun and easy. They give a good workout here for sure. I've seen events for the kids and they're a lot of fun. The community here is very nice.
I’ve been taking Jiu Jitsu and Muay Thai classes at Sigma for eight months now. When I walked in I was 54 years old, had played sports and was doing yoga and exercise classes at the gym, but I was a little bored and looking for something different. I definitely found it at Sigma.
New to muay thai? Start at Sigma Martial Arts & Fitness
Sigma Martial Arts & Fitness comes up as a beginner-friendly gym — noted on their own site. If you've never thrown a punch or a kick, 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 to start — you get in shape by training, not before it, and coaches scale the conditioning to you. Second, you won't be thrown into sparring — reputable gyms build fundamentals (stance, footwork, and the basic strikes of the "art of eight limbs") for weeks before any contact, and sparring stays optional. Third, 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 gyms are happy to let you watch or try a class first, so reach out before you commit.
Your first muay thai class at Sigma Martial Arts & Fitness
Nervous about walking into a muay thai gym for the first time? Almost everyone is, and good coaches 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 the basics on pads and bags — not fighting. Rest whenever you need to; no one will bat an eye. What to wear: shorts or athletic wear and a t-shirt; you'll train barefoot on the mats. What to bring: water and hand wraps if you have them — many gyms lend gloves for a first class, so it's worth asking when you call. As you keep training you'll add your own gloves, wraps, a mouthguard, and shin guards. Sparring is optional and comes later, once your fundamentals are solid. Arrive 10–15 minutes early to sign a waiver and meet the coach. It gets easier fast — most people feel far more at home by their third class.
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