The Best HIIT Gym in Downtown Denver
Get 1 Week for $20
If you’re looking for the best HIIT gym in downtown Denver, you’ve found it. The FIIT Co. has been training Denver’s most committed athletes, beginners, and everyone in between for over 13 years. Located at 2110 Market Street in the heart of Denver’s Ballpark neighborhood — steps from RiNo, Five Points, and LoDo — we offer high-intensity group fitness classes that build real strength, torch fat, and push you to train for whatever adventures life throws your way.
We’re not a big-box gym. We’re not a franchise. We’re a coach-led, community-driven studio where every member is known by name and every workout is designed with purpose.
What Makes The FIIT Co. Different
FIIT stands for Full-Intensity Interval Training. Our classes blend strength training with high-intensity conditioning in thoughtfully designed circuits that challenge your entire body in under 45 minutes. But what really sets us apart from other downtown Denver gyms isn’t just the workout — it’s how we do it.
We train barefoot. It might sound unusual, but barefoot training is one of the most effective ways to improve your balance, stability, posture, and overall movement quality. Your feet contain over 100 muscles, tendons, and ligaments that go dormant inside thick sneakers. Take the shoes off, and your body learns to move the way it was designed to.
Our coaches are certified, experienced, and genuinely invested in your progress. They’ll learn your name, correct your form, scale exercises to your level, and push you when you need it. This isn’t a place where you disappear into the crowd.
Our Classes
We offer a diverse rotation of group fitness classes throughout the week, so your body never adapts and your workouts never get stale:
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Strength Upper & Strength Lower
Dedicated lifting days focused on building real muscle through upper/lower body splits. These classes prioritize progressive overload and proper form, giving your muscles the focused attention they need to grow.
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FIIT Push & FIIT Pull
High-intensity circuit training that targets the front and back of the body respectively. These are our signature HIIT-style classes designed to spike your heart rate and keep it elevated through dynamic, full-body movements.
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Boxing & Kickboxing
Heavy bag work, mitt drills, coordination training, and plyometric conditioning. All skill levels welcome — our coaches will adapt the workout to meet you where you are.
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Hell’s Kettlebells
Multi-planar kettlebell training that builds core stability, grip strength, and functional power through fluid, controlled movements.
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Abs & Assets
A targeted class designed to sculpt and strengthen your core and glutes for better athletic performance and posture.
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Hustle
Our coach-programmed, flavor-of-the-day bootcamp. Expect the unexpected — this one keeps you on your toes.
Located in the Heart of Downtown Denver
The FIIT Co. is located at 2110 Market Street, Denver, CO 80205 — right in the Ballpark neighborhood between RiNo and LoDo. We’re just blocks from Coors Field, Union Station, and the heart of downtown.
Free 2-hour parking and metered parking are available on Market Street directly in front of the studio. For those commuting by bike or transit, we’re easily accessible from multiple RTD routes and the 38th & Blake commuter rail station.
Our hours are built for working professionals: classes run from 5am to 8am, 11:30am to 1pm, and 3:30pm to 7pm Monday through Friday, with weekend classes from 8:30am to 11am. Whether you’re an early bird, a lunch breaker, or an after-work warrior, there’s a class that fits your schedule.
Pricing & Memberships
We offer flexible membership options to fit your lifestyle:
Unlimited monthly membership: $169/month
8 classes per month: $139/month
6 classes per month: $119/month
4 classes per month: $99/month
We also offer class packages for those who prefer flexibility without a recurring commitment:
10 classes for $244
15 classes for $299
20 classes for $384
Drop-in classes are $33.
Try Your First Week for $20
Not sure if The FIIT Co. is for you? Try a full week of unlimited classes for just $10. No commitment, no pressure — just show up, work hard, and see how it feels. Most people who try us don’t leave.
We’ve earned a 4.9-star rating across 187+ Google reviews because we deliver results, build community, and make fitness something you actually look forward to. Come see why The FIIT Co. is downtown Denver’s best HIIT gym.