Onyx Club


300 Summit Blvd
Broomfield, CO 80021



Life Time Athletic Flatirons

Renovations are currently underway with an anticipated Grand Reopening event later this year. Life Time Athletic Flatirons will be an upscale athletic resort with over 80,000 square feet of best-in-class amenities and programs.

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Where Health Meets Luxury

Life Time is excited to bring you a world-class health and fitness experience unlike any other. Get ready to join a strong community with the best people, places and performers.

The exterior of the Life Time Athletic Flatirons in Broomfield, CO

Spaces Beyond Compare

Filled with a resort’s worth of amenities and spaces that inspire, this is the best place to warm up, work out and unwind.

Images are representative of actual spaces.

Get Stronger With the Best Programs and Instructors

Do what you love

90+ Weekly Classes

8 Signature Classes

In The Club
Services & Programs


Health Assessments

Social Events

Nutritional Coaching

Weight Loss Programs

Child Center

Kids Academy

Kids Sports

Run Club

Cycle Club

Kids Camps

Personal Training

Group Fitness Classes


Indoor Cycle



Basketball Leagues


Outdoor Tennis Courts

Yoga Studio

Pilates Studio

Fitness Studio

Indoor Pool

Outdoor Pool

Lap Pool


Steam Room



Basketball Courts

Cardio & Weights Floor


Indoor Cycle Studio

Healthy & Convenient

Fuel your body with nutritious meals and care for your hair, skin, nails and muscles without leaving the club. 

If it’s here, it’s healthy. Enjoy chef-crafted meals and healthy takeout options, smoothies and yummy favorites for the kids.

Love your body. Relax from head to toe or focus on recovery between workouts and receive 40% off your first-time hair, skin, nail and massage services.

Clubs Nearby

Explore other Life Time clubs in your area.

The outside of Life Time Fitness, the best health club in Westminster, CO
Life Time Fitness Parker-Aurora, the premier health club in Parker, CO
The Life Time Athletic and Tennis complex, the premier tennis facility in Centennial, CO