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SIN Fitness
5 ★★★★★ 108 Google reviews · Barre studio in Berlin, Connecticut
Lively gym offering classes such as barre and boot camp in a welcoming space.
Plan your first class
- Free first class or intro offer new members are welcomed with a free class or a discounted intro pass — check their site to book your first class
- Teacher training offers teacher training — ask about upcoming instructor cohorts and prerequisites
- Today see hours ·
- Phone +1 860-500-1035
- Website & schedule sinfitberlin.com — book classes and see the live schedule
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 |
What's on offer
“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.”
What members say again and again
“The facility is very clean and well maintained, equipment is all in excellent condition.”
“Walking in for the first time was honestly intimidating for me, but from day one I felt welcomed and supported.”
“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.”
“I have been a member now for over 3 years and at 62 years old, I am in the best shape of my life thanks to SIN!”
“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.”
From the reviews
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!
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.
I can’t say enough great things about Strength in Numbers! The coaches are friendly, supportive, and knowledgeable. The atmosphere is welcoming, fun, energetic and never ever boring.
I have to give a huge shoutout to SIN Fitness here in town! I’d been eyeing them for a while, wanting to get back into a gym routine. When I got a free week coupon, I knew it was a sign to finally check it out. At the time I was 4 months pregnant and a bit nervous (but also excited!
Teacher training at SIN Fitness
SIN Fitness comes up for teacher training — confirmed on their own site. If you're thinking about becoming a barre instructor, a few things are worth asking up front. First, which certification the program leads to — many boutique studios run a proprietary, method-specific training (Pure Barre, Bar Method, and barre3 each certify you in their own format), while others offer a more general barre certification you can teach anywhere. Second, the schedule and prerequisites — trainings often run as intensive weekend blocks or over several weeks, and most studios want you taking classes there regularly first. Third, cost and payment plans, and whether tuition includes an unlimited membership for the training period. Teacher training is a real commitment of time and money, so it's worth a call or an info session before you enroll.
Your first barre class at SIN Fitness
New to barre? Almost everyone is their first time, and a good studio expects beginners to walk in the door. Here's what to know. What to expect: barre blends small isometric holds and tiny pulses at a ballet barre with light weights and mat work — it's low-impact and joint-friendly, but it works muscles you didn't know you had, so a little shaking in your legs is the point, not a problem. Rest whenever you need to; no one will bat an eye. What to wear: fitted leggings and a top you can move in — nothing baggy, so the instructor can see your form. Grip socks: most barre studios require grip socks — bring a pair or check whether they sell them at the front desk; the grippy soles keep you steady during the pulses. What to bring: water and a small towel. Arrive 10–15 minutes early to sign in and meet your instructor. It clicks fast — most people say their third class feels completely different from their first.
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