Look & Feel Your Best!

Our variety of awesome classes & amazing people help you stay motivated and reach your fitness goals

Group Fitness Gym in Berlin, Connecticut

Supportive Community
Personal Attention
You’ll Love Your Results

Supportive Community
Personal Attention
You’ll Love Your Results

Looking and feeling your best doesn’t have to be hard.

We’ll show you how.

Staying committed to exercise can be a struggle!

  • Finding the time
  • Staying motivated
  • You don’t know how to use the equipment
  • No encouragement or support to reach your goals
  • And those same old workout routines can be SO discouraging!

We Make It Easier to Reach Your Fitness Goals

Variety of Classes

Our many classes offer something for all skill levels and ages. They are fun yet challenging enough to keep you engaged. Workouts are always evolving so you won’t get tired of the same old thing.

A Fitness Family

Our supportive community will welcome you like family. You’ll feel valued and part of the team regardless of your fitness level. Our group fitness atmosphere is supportive and encouraging.

Supportive Coaches

Our friendly, knowledgeable coaches provide the personal attention and motivation you deserve. They get to know you and your abilities and will adjust workouts when needed.

Get the Motivation & Support You Need

At SIN Fitness, we believe getting and staying in shape shouldn’t feel like an unbearable chore. We’ve all been there. We know the struggle is real. And we’ve created a group fitness gym in Berlin that provides the solution.

We make fitness fun so you stay committed and become the healthy and confident person you deserve to be! You’ll look forward to going to the gym and leave feeling amazing!

You’ll Fall in Love with the SIN Fitness Family

Google 5 Star Review

“I joined SIN Fitness in November 2019. 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. The coaches are outstanding. They are constantly motivating members to do their best and work hard. I leave there every single time feeling amazing!”

—Maria Mullally

Google 5 Star Review

“I joined this gym about 7 months ago. At 59 years old I felt I was losing flexibility and strength. My two daughters are members and they talked me into joining. I was so nervous going in but the jitters quickly vanished. I was met with such a supportive, encouraging staff and friendly members. I have done all the different classes and have found them all to be challenging and fun. I am feeling so much stronger and I love my time at this gym!!”

—Lynne Blais

Our Easy Plan to Get Started

2 happy ladies at SIN Fitness gym in Berlin CT. Start your 7 day free trial
Step 1

Start your 7 day free trial

Fill out and submit the Free Trial request form. We’ll contact you right away to answer any questions and schedule your first class.

Six happy women enjoying the benefits of group fitness support at SINFIT gym in Berlin, Connecticutt
Step 2
See how we can help

Experience workouts you’ll love with people you’ll love working out with. See how staying committed to the gym is easier than you thought.

Enjoy the body and health you deserve! Three happy women enjoying the smoothie bar after a energizing group fitness workout at SINFIT group fitness gym near me.
Step 3

Enjoy the body & health you deserve!

Imagine a new you! You’ll feel increased energy, strength and endurance after only a few weeks. You’ll be looking and feeling your best in no time!

Try SIN Fitness Gym in Berlin Today & Change Your Life for the Better

The gym can be a struggle for us all – finding the time, staying motivated, and the same old routines can be SO discouraging!

SIN Fitness provides a variety of awesome classes with amazing people that motivate each other to succeed.

We make it easier for you to stay committed and become the healthy and confident person you deserve to be!


Stay committed and become healthy and confident at SINFIT group fitness gym in Berlin, Connecticut

Membership Options

Only 48-hour notice to cancel
No contracts
30-Day money back guarantee

SIN Fitness gym in Berlin CT makes it easy for you to find a sustainable balance between life and fitness. Since life’s challenges are never in short supply, we believe in providing a reliable environment of support, positivity, and inspiration for all members.

The Launch


Attend up to 8 classes a month

This option is perfect if you're just starting out, looking to add variety to what you're already doing, or just have limited time.

Life Changer


Attend up to 13 classes a month

If you're serious about change and can make it to the gym at least 3 days a week, this is the option to help you do that.



Attend unlimited classes

With unlimited classes you can attend as many classes as you want, giving you maximum potential for dramatic change.

I’m ready for a change!

* Memberships are ongoing, billed monthly to a checking account or credit card. No contracts, only 48-hours notice needed to cancel membership. Payments for monthly dues will be charged on the same date each month.  It's that easy!

We accept all major credit cards

We accept all major credit cards: Visa, Mastercard, American Express and Discover
women enjoying a workout at SIN Fitness in Berlin, CT
We also offer…

Class Card

$175/12 classes

Our class cards never expire, and they are perfect if you're looking for a flexible way to attend classes when convenient for you without a monthly fee.