Fierce45, a Denver-born reformer Pilates brand, opened in Castle Rock this summer at 658 Genoa Way, Unit C. It's the same brand Westword named Best Pilates Studio in its 2026 Best of Denver, so it shows up with a reputation already built.
It's in the Genoa Way plaza — the same building as Gracie Barra and The Rock Salt Spa — in the Unit C space that used to be the boxing-circuit gym 30 Minute Hit.
What Fierce45 is
Fierce45 runs 45-minute, high-intensity, low-impact reformer Pilates classes on its own machine, the FierceFormer. The studio's shorthand for the workout is "low-impact on your joints, high-intensity on your muscles" — a full-body, small-group class built around strength, flexibility, and endurance, with what the brand calls "endless variations, energizing music, and motivating coaches."
Expect a faster, sweatier session than a traditional slow mat class. The coaches, in the studio's words, are "alignment savvy, muscle engagement focused, and fierce movement trained."
The award
Westword's Best of Denver is the paper's annual best-of-the-metro roundup, and Fierce45 took the Pilates category in 2026. The brand's Instagram, @fierce45, is past 10,000 followers, and the Castle Rock studio's early Google reviews sit at a 5.0.
What it costs
New clients start with an intro offer — two weeks unlimited for $65. After that:
- Memberships (new-member rate, $119 first month, 3-month commitment): 4×/month $119, 8×/month $179, 12×/month $209, or unlimited $229/month. Military, senior, student, and teacher discounts are available with verification.
- Class packages: drop-in $35, 5-class $160, 10-class $300, and 20-class $500 ($25/class).
Classes run seven days a week — early mornings (as early as 5:30 a.m.) plus some weekday evenings, with weekend classes in the morning only. Coaches include Jessica Mack, Patti Lonsbury, Lauren Sanchez, and Catherine Brogno.
- Where: 658 Genoa Way, Unit C, Castle Rock, CO 80109
- Workout: 45-minute reformer Pilates on the FierceFormer, all levels
- Intro offer: Two weeks unlimited, $65
- Book / schedule / pricing: fierce45.com/pricing/castle-rock
- Contact: [email protected] · Instagram @fierce45
The best way to reach the studio is by email or an Instagram DM.
See the full listing on our Fierce45 Castle Rock directory page, or browse more new and coming-soon businesses in Douglas County.
Sources: Fierce45 Castle Rock location page, Fierce Movement, and Fierce45's Instagram @fierce45. Details, pricing, and the class schedule may change — confirm on the Fierce45 site before you go.