Special Offer: Free Session With A Certified Personal Trainer

Sign up to receive a free training session with a Bella Strength coach. No hooks, gotchas, or pushy sales. We’ll even provide you a post workout beverage, on the house. 

Act now, our capacity is limited. 

Bella Strength is A Gym With A New Approach to Fitness


Personal Training

At Bella Strength, you won’t jump into a group class that’s overwhelming or too intense. We start every member with 8 private sessions to show you the ropes, correct your imbalances, and perfect your form.​


Strength & Conditioning Classes

With a membership, you’ll enjoy unlimited group classes everyday of the week between 5:45am and 5:30pm. Each day we alternate strength training classes with conditioning classes to give you a complete fitness solution. 


Health + Wellness Coaching

Learn what foods work best for your body so you can lose weight, increase your energy level, or just feel better all day long. Bella Strength has a certified Health & Wellness coach, so you don’t have to figure out your nutrition on your own. 


Supportive Community

Bella Strength is more than just a gym. Our members know how to support one another. Each day you come to class you’ll see familiar faces and be pushed to achieve your goals by our motivating and inspiring coaches.

Every Membership is Unique.

After you complete your personal training sessions, you & your trainer decide the next steps.

Choose Between One Of Three Membership Types:

Unlimited group classes

Our group classes alternate between strength training & conditioning. We're not about destroying you so you're sore for a week, our class programming is sustainable and gets results.


Flex members enjoy unlimited group classes as well as four personal training session. This provides a balance of community and personalized attention.


Personal training packages include 60 minute private sessions with your personal coach. Your goals, limitations, and imbalances will provide direction for the sessions.

What Our Members Say:

Don’t take our word for it, check out what our members have to say. 

“Bella Strength is by far the best gym I’ve ever been to. It offers a personalized experience where the coaches know you and your individual goals and injuries or mobility limitations, with the fun of a group ex environment…”

BELLA STRENGTH Member Libby Horton

“I’ve tried a bunch of local gyms and this by far is the BEST in Boulder!  It feels like you’re part of a community and every class is unique and taught by incredible coaches…”

BELLA STRENGTH Member Tasha Kelly

“If you truly care about getting in shape and want to be pushed both mentally and physically this is the gym for you…”

BELLA STRENGTH Member Adam Wertz

New To Working Out? We Got You.

The coaches at Bella Strength are motivating and inspiring, no matter what your level of fitness is when you begin. If you want to burn fat or increase muscle tone, we can help you achieve your goals — not just quick fixes. 

After you meet our coaches and become a member of our supportive community, your only regret will be that you didn’t start sooner.

Personalized Goal Setting

We'll help you achieve your goals, whether you want to lose weight, get toned, or just feel more confident in your own skin.

Individualized program

Every membership and workout plan is personalized to you. We work with you to decide the best balance of personal training and group classes.


Our coaches care about your success and that doesn't stop when you leave our gym. We're here to help you succeed.

Meet Your New Team Of Coaches.

Karen Harbour

Owner + Head Coach
Karen is the co-founder of Bella Strength and a Head Coach. With over 20 years of fitness experience, she is extremely passionate about teaching people how to move their body well so they can be everyday fit.

Jon Harbour

Owner + Head Coach
Jon is the co-founder of Bella Strength and a Head Coach. He holds a number of different coaching certifications and has trained under and worked with several world renowned coaches in the strength and conditioning field.

Jena Franz

Head Coach
Jena is a Head Coach at Bella Strength. Jena was a competitive gymnast for eleven years and also competed at the collegiate level in pole vaulting. With a passion for athletics, she decided to pursue fitness as a career.

Meagan Bertoni

Health & Wellness Coach
Meagan wears several hats at Bella Strength. With her wide range of experience, Meagan brings energy to the group classes, while also working one-on-one with members seeking to make changes to their nutrition and lifestyle.

How To Find Bella Strength

Bella Strength is located in North Boulder, off of 28th street near CorePower Yoga. Parking is plentiful!

Our Address: 
Bella Strength
3280 28th St, Suite 4
Boulder, CO 80301

Phone: (303) 395-1600
Email: info@bstboulder.com

Hours of Operation:

Mon - Thurs 05:45 AM - 06:30 PM
Friday 05:45 AM - 05:30 PM
Saturday 07:30 AM - 10:00 AM
Sunday 09:00 AM - 11:00 AM

Reserve Your Free Training Session & Post-Workout Drink.

Meet with one of our coaches for a free training session and find out why our members say that we’re the best gym they’ve ever been to.

We'll even provide you with a complimentary post workout drink. Your choice between our on-tap Kombucha or FitAid. 

Hurry, this offer won't last long. Sign up while this offer is still available.  

When you sign up, we'll contact you to schedule your free session. We'll also keep you updated with a few emails per month.