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KnuckleUp Fitness

3.8 ★★★★☆ 117 Google reviews · Muay thai gym in Sandy Springs, Georgia

Muay Thai gym Free trial Beginners welcome Kids & teens Fight team

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
  • Fight team a competition team for members who want to test themselves as amateur fighters
  • Today see hours ·
  • Website & schedule knuckleupfitness.com — book classes and see the live schedule
  • Phone (404) 339-5425

Hours

Monday 9:30 AM–9 PM
Tuesday 9:30 AM–9 PM
Wednesday 9:30 AM–9 PM
Thursday 9:30 AM–9 PM
Friday 9:30 AM–8 PM
Saturday 9:30 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 KnuckleUp Fitness, confirmed in members' own reviews and the gym's own info — not guessed from the sign out front.

🌱 Beginner Muay Thai 2 mentions

“Classes focus not only on the fundamentals of beginners and advanced BJJ technique but also the principles of discipline, endurance, and teamwork applicable in all aspects of life.”

All gyms that run beginner muay thai →

🧒 Kids Muay Thai 6 mentions

“My son has been going to KU since he was 4 years old and for the last 3 years it’s been an amazing experience.”

All gyms that run kids muay thai →

🏆 Fight Team

“My son started to compete last year and the coaches made it a great (and sage) experience.”

All gyms that run fight team →

📘 Fundamentals 2 mentions

“Classes focus not only on the fundamentals of beginners and advanced BJJ technique but also the principles of discipline, endurance, and teamwork applicable in all aspects of life.”

All gyms that run fundamentals →

Other martial arts here

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

🦵 Kickboxing 7 mentions

“I love this gym and love their kickboxing classes.”

Other gyms that also teach kickboxing →

🥊 Boxing 2 mentions

“I mostly do CrossFit and boxing.”

Other gyms that also teach boxing →

🥋 Brazilian Jiu-Jitsu (BJJ) 11 mentions

“Classes focus not only on the fundamentals of beginners and advanced BJJ technique but also the principles of discipline, endurance, and teamwork applicable in all aspects of life.”

Other gyms that also teach brazilian jiu-jitsu (bjj) →

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 117 Google reviews — in their own words.

🧑‍🏫 expert, authentic coaching 4 mentions

“The coaches are amazing and the wider BJJ community is very supportive and inclusive.”

🌱 welcoming to beginners 6 mentions

“Classes focus not only on the fundamentals of beginners and advanced BJJ technique but also the principles of discipline, endurance, and teamwork applicable in all aspects of life.”

🤝 no-ego, friendly gym 20 mentions

“The culture at KnuckleUp is excellent, offering a great balance of friendly environment and focused technique.”

📘 real technique & fundamentals 5 mentions

“Classes focus not only on the fundamentals of beginners and advanced BJJ technique but also the principles of discipline, endurance, and teamwork applicable in all aspects of life.”

🔥 killer workout & conditioning 2 mentions

“This is a respectful atmosphere where; one can break a sweat, gain confidence, and learn a valuable skill in a "hands on" environment.”

🥊 legit sparring & fight team 2 mentions

“My son started to compete last year and the coaches made it a great (and sage) experience.”

From the reviews

Amazing gym with a great staff, class schedule, and culture. They were very transparent about fees and the cancellation policy when I initially registered and have always been available for questions about my membership. Highly recommend giving this gym a chance, especially since they offer a free trial.

★★★★★ — Emerson, Mar 2022

Very friendly staff. Great coaches. I mostly do CrossFit and boxing. Have tried kickboxing couple times. The instructors are great and the members are supportive and helpful. I joined a month after moving to the area from NYC and I’m glad I did.

★★★★★ — Sailu, Jun 2022

This school (and I've been to a few) is great! So much so that my son joined too. The owner and instructors really stress the practicality of techniques for the beginners and the safe practice for all students.

★★★★★ — Jay, Jan 2023

KnuckleUp has been eye opening! I came into the gym with a very surface level knowledge of combat sports (loved watching mma, and was always into some of the components of it), and I feel like I learn every time I’m here. Their group classes are awesome, with high energy and friendly instructors.

★★★★★ — Steve, Feb 2023

Excerpts from public Google reviews. Read all 117 reviews →

New to muay thai? Start at KnuckleUp Fitness

KnuckleUp Fitness comes up as a beginner-friendly gym, going by their listing and members’ reviews. 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.

Check beginner classes on their site

Your first muay thai class at KnuckleUp 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.

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 KnuckleUp Fitness

5290 Roswell Rd Suite O, Sandy Springs, GA30342

Get directions

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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.