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Xtreme Ninja Martial Arts & Fitness Center

4.9 ★★★★★ 217 Google reviews · Muay thai gym in Medford, Massachusetts

Muay Thai gym Free trial Kids & teens Private lessons Fitness classes

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
  • Kids & youth classes kids and youth muay thai classes — built around discipline, focus, and confidence
  • Private lessons private, one-on-one coaching available — a focused way to start or to work around a busy schedule; ask about availability and rates
  • Fitness & conditioning muay thai fitness and cardio classes — a serious workout you can do without ever having to spar
  • Sparring & clinch sparring and clinch sessions for members ready for controlled contact — always optional and coach-supervised
  • Today see hours ·
  • Website & schedule xtremeninja.com — book classes and see the live schedule
  • Phone (781) 395-7131

Hours

Monday 8:30–11 AM, 3:30–8:30 PM
Tuesday 3:30–8:30 PM
Wednesday 8:30–11 AM, 3:30–8 PM
Thursday 3:30–8:30 PM
Friday 4:30–8 PM
Saturday 8:30 AM–1 PM
Sunday Closed

Hours shift for holidays, seminars, and open-gym times — worth a quick check before a special trip.

The classes they run

Muay thai classes on the schedule at Xtreme Ninja Martial Arts & Fitness Center, confirmed in members' own reviews and the gym's own info — not guessed from the sign out front.

🧒 Kids Muay Thai 32 mentions

“My son has been taking lessons here for over a year now, and recently held his birthday party at the center as well, and it was a BLAST!”

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Teen Muay Thai

“The staff at Xtreme Ninja have an excellent teaching style that is great for children, teens and adults.”

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👤 Private Lessons 2 mentions

“Honestly, I can't wait to hear back so my son can get into private lessons with Will.”

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🥊 Sparring

“Its a very friendly atmosphere and all the kids get along very well, the coaches are very attentive the entire time, especially during sparring.”

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🛡️ Self-Defense

“Self defense and kickboxing and amazing boot camps and intense classes that are completely rigorous in all the right ways.”

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Other martial arts here

Muay thai gyms are usually multi-discipline. Here's what else members mention training under the same roof at Xtreme Ninja Martial Arts & Fitness Center — mined from their reviews and the gym's own info.

🦵 Kickboxing 3 mentions

“Self defense and kickboxing and amazing boot camps and intense classes that are completely rigorous in all the right ways.”

Other gyms that also teach kickboxing →

🎽 Karate 5 mentions

“The kids all got to participate in a fun karate class, and my son got to cut his cake with a sword, which was a real highlight.”

Other gyms that also teach karate →

Disciplines are mined from reviews and the gym's own info — they show what members have trained, not a formal class guarantee. If you specifically want BJJ, boxing, or MMA alongside muay thai, confirm the current schedule with the gym.

What members say

The things reviewers bring up again and again across 217 Google reviews — in their own words.

🤝 no-ego, friendly gym 15 mentions

“As a family, we also truly appreciate the balance of focusing on fun while teaching important skills like respect and commitment through the sport.”

📘 real technique & fundamentals 2 mentions

“Each session is like a one hour transformation into the Man of Steel.”

🧒 strong kids program 2 mentions

“Will was extremely patient, and kind, while still teaching my son moves and discipline like bowing when entering the mat and his new favorite move push kick.”

🥊 legit sparring & fight team 3 mentions

“Its a very friendly atmosphere and all the kids get along very well, the coaches are very attentive the entire time, especially during sparring.”

🧠 builds confidence & discipline 12 mentions

“He has acquired self-control, respect, focus, a team attitude, leadership skills which all have been demonstrated in his actions beyond the dojo, particularly at school.”

From the reviews

Couldn’t have made a better decision on the place we chose to send our son for his Karate and Muay Thai experience. Nothing but great experiences with the whole staff. Very family orientated, personable, excellent values taught, confidence building at it’s finest.

★★★★★ — Andrew, Dec 2022

Great place for families and adults who are looking to get healthy and stay in shape. Plus the instructions are very professional and caring to the children who come in to do karate and kids mauy thai! They have changed my son 's life. My daughter loves going to xtreme ninja!

★★★★★ — Mary, Dec 2019

Before I moved to the area and came to Xtreme Ninja Martial Arts & Fitness Center, I was not exercising, unhappy, overweight, and anti-social. Since I began training and exercising here for the past five months, I have a lost 20 pounds so far and I now live a healthier and happier lifestyle.

★★★★★ — Manny, Nov 2019

Very friendly and experienced trainers here to help with various fitness methods. Self defense and kickboxing and amazing boot camps and intense classes that are completely rigorous in all the right ways. They offer classes ranging from fitness and well-being to high level martial arts and everything in-between.

★★★★★ — Michael, Oct 2022

Excerpts from public Google reviews. Read all 217 reviews →

Your first muay thai class at Xtreme Ninja Martial Arts & Fitness Center

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.

Muay thai is a contact sport. Ease in, listen to your coaches, and if you have any injuries or health concerns, mention them before class and check with a doctor if you're unsure.

Where to find Xtreme Ninja Martial Arts & Fitness Center

45 Riverside Ave, Medford, MA02155

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Listing verified July 2026 from public business records and member reviews. Something out of date? Report a correction. Own this gym? Claim your listing — it's free.