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KnuckleUp Fitness

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

Kickboxing gym Free trial Beginners welcome Kids & teens Cardio kickboxing Competition 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 fitness levels welcome, including total beginners — no experience needed, and you get in shape by training, not before
  • 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
  • Competition team a competition team for members who want to test themselves in the ring — amateur kickboxing, muay thai, or K-1
  • 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 and class-schedule changes — worth a quick check before a special trip.

The classes they run

Kickboxing 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.

🔥 Cardio Kickboxing 6 mentions

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

All gyms that run cardio kickboxing →

🧒 Kids Kickboxing 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 kickboxing →

🌱 Beginners 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 beginners →

🏆 Competition Team 2 mentions

“The instructors are all fantastic and have created a great training environment that suits anyone (hobbyist or a competitor) who steps on the mats.”

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🥊 Boxing 2 mentions

“I mostly do CrossFit and boxing.”

All gyms that run boxing →

Other martial arts here

Kickboxing 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.

🥊 Boxing 2 mentions

“I mostly do CrossFit and boxing.”

Other gyms that also teach boxing →

🥋 Brazilian Jiu-Jitsu 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 →

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 117 Google reviews — in their own words.

🌱 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.”

🎉 fun, high-energy classes 2 mentions

“Their group classes are awesome, with high energy and friendly instructors.”

🧠 builds confidence & relieves stress 2 mentions

“The owner and instructors really stress the practicality of techniques for the beginners and the safe practice for all students.”

🤝 friendly, family gym 20 mentions

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

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 kickboxing? 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 class is for. A few things worth knowing before your first week. First, you don't need to be fit or coordinated to start — you get in shape by training, not before it, and coaches scale every drill to you. Second, you won't be thrown into hard sparring — reputable gyms build the basics (stance, footwork, and punches and kicks on pads and bags) first, and any contact eases in gradually under a coach's control. Third, all fitness 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 kickboxing class at KnuckleUp Fitness

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 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.