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Based on 52 reviews



What our Members are Saying About Bella Strength!

Bella Strength Member and Personal Training Testimonial

“The best gym I’ve ever experienced. Great coaching, good camaraderie, fun and supportive atmosphere.”

Laura Yasuda
Bella Strength Member and Group Fitness Classes Testimonial

“If you truly care about getting in shape and want to be pushed both mentally and physically this is the gym for you. The strength and conditioning combinations increase strength while also increasing your cardiovascular threshold. No one does it better!”

Adam Wertz, Your Content Goes Here
Bella Strength Member, Personal Training and Group Fitness Class Testimonial

“Possibly the cleanest gym in Boulder, with lots of top end equipment. Great coaching and I love the organization into mesocycles so we can see real improvement across our lifts/movements!”

Andy Newman
Bella Strength Member and Personal Training Testimonial

“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. Everyone is laid back and friendly, but also serious about proper technique. I’m constantly being challenged and learning something new. After 6 months at Bella, I am stronger than I have ever been.”

Libby Horton

Our Facilities


Jena Franz
Jena FranzLead Coach + General Manager
Jena Franz is the Lead 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.
Kara Wolley
Kara WolleyCoach
Kara is a Colorado native who lives for fresh air above treeline. Kara began her athletic adventures at the age of 8 as a competitive swimmer which continued through college. Since then, Kara has found her love of the ”runner’s high” adventuring over Colorado peaks, completing various distances of races ranging from marathons to 50 milers.
Jenna Poppenhagen
Jenna PoppenhagenCoach
Jenna has been coaching since 2014. Her journey started in CrossFit, but she has been expanding her knowledge in the world of strength and conditioning ever since. Before finding fitness, she was a classical singer/aspiring rock star, and only dabbled in light exercise. This lack of former physical prowess helped shape her coaching style and her love for the transformational potential of fitness for not only the body, but the mind and heart. When she’s not in the gym she enjoys cooking tasty foods, riding dirt bikes with her husband, playing board games with friends, and, of course, snuggling her chihuahua, Peanut.
Zac Lokay
Zac LokayCoach
Zac has spent his whole life playing soccer, even playing at a DIII level at the University of Puget Sound
and going as far as Sweden to play semi-professionally. While at school, Zac majored in Exercise Science
with a Neuroscience Emphasis. Zac has worked with a wide range of athletes of various ages and skill
levels, doing sports performance for athletes of all ages from 11 to college aged. He has also helped lead
group classes for people of all different experience levels. When not in the gym, you can find Zac coaching and playing soccer, dabbling in guitar and piano,
enjoying hiking the Colorado wilderness, and on a very rare occasion playing a very poor round of golf.
Karen Harbour
Karen HarbourCoach - Owner
Karen Harbour is the co-founder of Bella Strength. With over 20 years of fitness experience, she is extremely passionate about teaching people how to move their body well so they can be #everydayfit.
Jon Harbour
Jon HarbourCoach - Owner
Jon Harbour is the co-founder of Bella Strength. 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.
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Ready To Crush Your Fitness Goals In 2019?

At Bella Strength, we offer personal training, small group strength and conditioning classes, remote coaching, and 24/7 gym access. We also have the best coaches in the business and an incredibly supportive gym community to help push and motivate you along every step of the way. We’re here to help you reach your fitness and health goals in 2019!