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SIN Fitness
5 ★★★★★ 108 Google reviews · Kickboxing gym in Berlin, Connecticut
Lively gym offering classes such as barre and boot camp in a welcoming space.
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
- Private lessons one-on-one coaching available — a focused way to start or to work around a busy schedule; ask about availability and rates
- Today see hours ·
- Website & schedule sinfitberlin.com — book classes and see the live schedule
- Phone +1 860-500-1035
Hours
| Monday | 5:30 am–9 pm |
| Tuesday | 5 am–9 pm |
| Wednesday | 5 am–9 pm |
| Thursday | 5 am–9 pm |
| Friday | 5:30 am–9 pm |
| Saturday | 7 am–1 pm |
| Sunday | 8–11 am |
The classes they run
“They offer a variety of classes for all fitness levels, ranging from barre to boot camp so something for everyone, or just a different flavor for your workout on different days.”
“They offer a variety of classes for all fitness levels, ranging from barre to boot camp so something for everyone, or just a different flavor for your workout on different days.”
“Not only they have great workouts but they have an amazing group of coaches that inspires you and motivates you!”
What members say
“) about diving back into fitness—especially after trying a CrossFit gym last summer that just didn’t have the warm, welcoming vibe I was looking for.”
“Not only they have great workouts but they have an amazing group of coaches that inspires you and motivates you!”
“Not only they have great workouts but they have an amazing group of coaches that inspires you and motivates you!”
“The facility is very clean and well maintained, equipment is all in excellent condition.”
“I joined Oct 2025 and have been so amazed at how quickly you can feel accepted as part of the community that is SIN; supportive, motivating and kind.”
From the reviews
I joined SIN November 2019 after Crossfitting for 6+ years. I wanted a gym that could challenge me but also understand that I'm a busy 40+ year old full-time working mom. This has been the BEST change in my fitness routine. Not only do I get a rigorous workout, I am surrounded by positive, warm and friendly people.
I never had any interest in fitness classes before I joined S.I.N. Once I started Kick-Fit, I never looked back. The coaches are so motivating, the classes are awesome, and the members are so welcoming! Don't hesitate to sign up! Once you do, you'll be hooked!
This is the best gym I have ever been a part of! The workouts are exactly what I was looking for, but more importantly, the coaches are amazing. They provide the perfect blend of pushing you to your limits and encouraging you to do your best.
Strength In Numbers is an amazingly supportive gym community. I enjoy the smaller class sizes and the feeling that I’m not in it alone. We’re all there struggling through the workout together to better ourselves. I’ve done so many things that I would never have attempted at the gym by myself.
New to kickboxing? Start at SIN Fitness
SIN 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 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.
Your first kickboxing class at SIN 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.
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