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Xtreme Ninja Martial Arts & Fitness Center

4.9 ★★★★★ 217 Google reviews · Kickboxing gym in Medford, Massachusetts

Kickboxing gym Free trial Kids & teens Cardio kickboxing Private lessons Affiliated

Affiliated gym — reviews and the gym's own info suggest it belongs to a known kickboxing or boxing-fitness franchise or network (think 9Round, iLoveKickboxing, CKO, TITLE Boxing Club or Jabz). Franchise gyms run a consistent class format and are often a friendly, familiar place to start. If a specific brand matters to you, confirm it on the gym's own site.

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
  • Cardio kickboxing classes high-energy cardio kickboxing on the bags and pads — a fun, sweaty workout built for fitness and weight loss, at your own pace
  • Kids & teen classes kids and teen kickboxing classes — built around confidence, focus, and fun
  • Private lessons one-on-one coaching available — a focused way to start or to work around a busy schedule; ask about availability and rates
  • Sparring sparring and partner work for members who want it — always optional, eased in gradually, with the coach controlling the contact
  • 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 and class-schedule changes — worth a quick check before a special trip.

The classes they run

Kickboxing 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 Kickboxing 34 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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🤜 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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🦵 Muay Thai 4 mentions

“Couldn’t have made a better decision on the place we chose to send our son for his Karate and Muay Thai experience.”

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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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Teens Kickboxing

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

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Kickboxing Bootcamp 2 mentions

“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

Kickboxing 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.

🦵 Muay Thai 4 mentions

“Couldn’t have made a better decision on the place we chose to send our son for his Karate and Muay Thai experience.”

Other gyms that also teach muay thai →

🥋 Karate 6 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 →

🛡️ Self-Defense

“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 self-defense →

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 muay thai, boxing, or MMA alongside your kickboxing, 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.

⚖️ great for weight loss 2 mentions

“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.”

🧒 strong kids program 3 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.”

💗 welcoming to women 2 mentions

“I'm a real life mom of two kids under 4.”

🧠 builds confidence & relieves stress 5 mentions

“Very family orientated, personable, excellent values taught, confidence building at it’s finest.”

🤝 friendly, family gym 17 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.”

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

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

I have really enjoyed taking classes (Kickboxing & XFit) with Xtreme Ninja over the past two years. Not only did I lose 20 lbs within the first six months of my membership, but I have been able to maintain my new weight and gain more muscle. I am stronger and leaner.

★★★★★ — Jennie, Mar 2025

Excerpts from public Google reviews. Read all 217 reviews →

Your first kickboxing class at Xtreme Ninja Martial Arts & Fitness Center

Nervous about walking into a kickboxing 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 — stance, footwork, and punches and kicks on pads or a heavy bag — not hard sparring. Go at your own pace and rest whenever you need to; no one will bat an eye. What to wear: comfortable athletic clothes you can move and sweat in, and supportive trainers. What to bring: water, and hand wraps and gloves if you have them — many gyms lend loaner gloves for a first class, so it's worth asking when you call. As you keep training you'll add your own gloves and wraps (and shin guards once you start sparring). Sparring is optional and eases in gradually, once your basics 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.

Kickboxing is a contact sport. Warm up, pace yourself, 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.