Receive a free intro session with a Bella Strength coach and learn how you can become the strongest & healthiest you’ve ever been. 

No hooks, gotchas, or pushy sales. 

Act now, our capacity is limited.


Personal Training

Everyone starts off at a different place. Fitness is NOT one size fits all.

It doesn’t matter if you are a pro or a beginner, the one-on-one personal training atmosphere we create with you and your coach is the simply the fastest, safest, and most effective way to lay the foundation for long term change.

Each session is approximately 60 minutes and is custom tailored to your long term success in the gym.

Group Classes

Our strength and conditioning classes are perfect if you prefer a group atmosphere. You still get the benefit of one-on-one attention from our expert coaches. Each class is pre-programmed well in advance, so you know exactly what to expect. You can pick the classes that are most appropriate for your goals and needs. 

Best of all, you can log and monitor your progress in our app!

Remote Coaching

If you spend a lot of time traveling for work or prefer to workout on your own, our coaches will develop the perfect training plan for you to achieve and maintain your success. 

All of our workouts are easily followed right from your phone via our app. They come complete with detailed videos and instructions so that you won’t miss a single rep.

24/7 Gym Access

Workout whenever you want, on your schedule. 

You can use this as a supplement to your personal training or group classes, or just as a stand alone gym membership. 

Our coaches can even program your workouts for you so that you make the most effective use of your time in the gym.


Choose Between One Of Three Membership Types:

Unlimited Group Classes

Group classes alternate between strength training & conditioning. We’re not about destroying your body so you’re sore for a week. Our class programming is sustainable and gets results.

Flex Membership

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

Personal Training Packages

Personal training packages include 60 minute private sessions with your personal coach. You and your goals will receive one-on-one expert attention every step of the way.


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…”
– Libby Horton
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“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…”
– 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…”
– Adam Wertz


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.
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Personalized Goal Setting

We’ll help you achieve your goals. Lose weight, get toned, or feel more confident in your own skin.

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Individualized Program

Every workout plan is personalized to you. We work with you to develop a plan to achieve your goals.

Support Outside the Gym
Our coaches care about your success and that doesn’t stop when you leave our gym. We’re here to help you succeed.


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.
coach jon
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.
coach jena
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.

coach meagan
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


We invite you to meet with one of our coaches for a free intro session so you can find out why our members say we’re the best gym they’ve ever been to. 

Here is what to expect during your introductory session with one of our awesome coaches:

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.