Fitness over 40Done right

We train grown-ups, not gym bros

Tired of guessing what to do at the gym? At Catalyst Fitness, we coach adults 40+ through smart, customized training that actually works for you.

Lose weight

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motivation

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wellness

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Strength

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longevity

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Fit-Over-40

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Accountability

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Semi-private

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StoryCorey and Katherine, owners of Catalyst Fitness - best gym in Denver, Colorado

Why Catalyst?

Because we understand What worked in your 20's just doesn't cut it anymore.

My wife and I started Catalyst Fitness because we noticed most gyms offer intensity without strategy. After 40, you need a program built around your body, your goals, and your life. That’s why our coaching combines structure, accountability, and customization—so you can finally see real progress without wasting time.

Meet our team

customization + Coaching = success

It's not that you need more motivation.
You need a better system.

Catalyst Fitness combines the personalized attention of private training with the energy and affordability of group workouts.

Our semi-private model ensures you never get lost in the crowd while benefiting from a motivating community atmosphere.

With workouts adapted to your specific needs and coaches who know your name, goals, and limitations, you'll experience fitness that finally works for your life.

Learn more

Don't just take our word for it

Hear from the Lakewood COmmunity

I joined Catalyst Fitness to get in shape for my wedding, and I'm so glad I did! I was nervous and intimidated going in but Corey and Katherine were so welcoming and helped me get settled in quickly. All of the coaches are great, they are invested in your goals and progress without being pushy.

Since starting at Catalyst I feel so much stronger, more confident, and excited to go to the gym and was finally able to complete my first pull up!

Christina Vance, gym member at Catalyst Fitness, best Personal Training in Denver, Colorado
Christina Vance

"Great place to get a targeted workout! I've been doing the semi-private training for 3 months now, very happy with the trainers, and I love the new workout series we just started. I can work out 3x a week and have something new every time, but easily see the progress I'm making.”

Wendy Harmening

“I’ve been at Catalyst since February 2024. I can’t speak highly enough for the quality of the coaches and workouts at Catalyst. The decision to partner with this gym for my health is one of the best decisions I’ve made. I signed up because I was constantly exhausted, grumpy, unfocused, not feeling like myself. Six weeks in, I felt balanced, focused, and had more energy than I’d had I years. Six months in I was thriving through bootcamp workouts, enjoying the community of people I saw several times a week. The coaches are engaged and engaging, allowing no one to slack off during workouts, but they do this without degrading dude-bro nonsense. Recently I signed up for their semi-private classes since I identified some specific goals I want to achieve. These classes are smaller and very personalized to achieve what I want. I’ve no doubt that continuing to partner with the coaches at Catalyst will get me there.”

Jordan Wyberneit, gym-member at Catalyst Fitness, best gym in Denver, Colorado
Jordan Wyberneit

"Not your ordinary boutique gym. I have been to plenty of gyms and Catalyst provides you a variety of classes to help you build strength that are both effective and fun. They also provide one on one personalized training sessions with knowledgeable trainers. Science shows diversity in your workouts prevents plateau and I love that they provide this. The trainers are unique as far as knowing what to coach but how to coach!And the best……Catalyst makes you feel part of their community.”

Duane Wishmeyer

"My husband and I signed up at Catalyst gym in January 2024 and it has been such a awesome experience, they have helped both of us reach our fitness goals and continue to strive for better health and wellness all around. All the trainers are so personable and spend the time to get to know you and what you need to do to meet the fitness goals you set for your self. The classes built for you to be able to modify where you need but also push you to hit the next level. I’m stoked I found a gym I can feel comfortable at and look forward to working out each day!”

Jay Digiacomo, gym member at Catalyst Fitness, Best personal training in Denver, Colorado
Jay DiGiacomo

Simply the best, Catalyst Fitness is hands down one of my favorite places to be! I was hesitant to get started but I have been a member of this gym for just over 6 months now. The structured, group style classes were exactly what I was looking for and the coaches are AMAZING! They are truly invested in your personal fitness journey and meet you wherever you're at.

Allen AAL
Jessica Danhof

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