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Guide to Denver

HIIT workouts

You need a high-intensity workout that pushes your limits without wasting a single minute of your time.

Based on 493 Opinions
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Updated May 2026
01
Base6 Fitness image 1
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Fitness center

Fitness center offers scalable HIIT workouts with daily varied classes. Intense HIIT sessions focus on athleticism and strength. Atmosphere is welcoming and supportive, building a strong community for all skill levels.

Challenging HIIT classes stand out with a focus on intensity and athleticism. Strength and barbell sessions complement the workouts, creating a well-rounded fitness experience.

People are saying

"You'll feel so comfortable with the friendly community here."

"I loved the individualized support and guidance for proper form in Functional Fitness."

"I found this to be the best gym I had been to."

Good to know

1

Base6 Fitness offers a variety of HIIT classes that change daily.

2

All exercises at Base6 are scalable for different fitness levels.

3

The gym has a flexible class schedule to accommodate various routines.

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Traverse Fitness image 1

Gym buzzes with high-energy atmosphere and strong community spirit. HIIT with Adam pushes your limits with intense endurance challenges. Facilities like sauna and cold plunge boost recovery, making it a true human optimization hub.

Classes include Strength, HIIT, and Altitude options. Workouts challenge endurance and strength, especially the HIIT with Adam sessions.

People are saying

"I found this gym to be the best I had ever been to."

"Chad's HIIT class pushed me to work my hardest."

"I loved the sauna and cold plunge area."

Good to know

1

Traverse Fitness hosts free park workouts for community members.

2

Happy hours are organized regularly to foster social connections among members.

3

Run clubs meet weekly, providing a fun way to stay active together.

03
Duality image 1
Fitness center

Fitness center shines with colorful lighting and lively music that boost energy. HIIT classes blend strength training and cardio for a tough, balanced workout. Friendly community and puppies in the lobby make every visit welcoming and fun.

Classes include circuit, HIIT, and ResCon, offering varied challenges. A strong community vibe supports motivation. Workouts mix strength training and cardio for balanced fitness.

People are saying

"This Yoga Spot has a welcoming community and supportive instructors."

"I found this to be the best gym."

"I loved the variety of HIIT and circuit classes offered here."

Good to know

1

Duality offers a wide range of classes that fit various schedules.

2

Parking is generally easy, even during peak hours.

3

The community hosts fun events like rooftop yoga and trivia night.

04
The FIIT co. image 1

Gym offers top-tier equipment and an energetic vibe with fun music. Jeff's intense HIIT classes and kettlebell sessions push limits. Community spirit and varied classes make workouts both challenging and welcoming.

Jeff leads difficult HIIT classes that kick off the day with intensity. Kettlebell sessions fit well alongside the weekly strength and HIIT workouts.

People are saying

"The trainers at this weight lifting gym are great at correcting your form."

"The gym coaches here really care about your form and push you to improve."

"The HIIT instructors are knowledgeable, funny, and supportive."

Good to know

1

The gym offers a variety of classes, including kettlebell workouts and kickboxing.

2

Parking is easy to find near the gym.

3

Classes are designed to be challenging yet can be done at your own pace.

05
Fit Collective Denver image 1
Fitness center

Fitness center shines with sunrise views and a supportive community. Group classes suit all levels with accessible workouts. HIIT sessions are intense and challenging, blending circuit and lifting formats for variety.

Classes include a HIIT strength option that is very intense and challenging. Multiple formats like circuit and lifting complement the HIIT offerings.

People are saying

"It's a fun, welcoming environment with a strong community feel."

"The instructors are so energetic and passionate; it's truly inspiring."

"The HIIT classes here are intense and challenging."

Good to know

1

Fit Collective offers a variety of classes including barre, lifting, and yoga.

2

Classes are designed to be accessible for all fitness levels.

3

Booking classes is easy through their user-friendly app.

06
The Gym Colorado image 1

Powerlifting gym offers 24/7 access with no wait for equipment. Workouts blend strength training and HIIT programming for a balanced routine. Friendly community creates a welcoming atmosphere for all skill levels.

Workouts combine strength training with HIIT programming for a solid mix. Sessions are streamlined to integrate both easily every week.

People are saying

"This gym's community makes you feel like you're working out with friends."

"Brandon makes weight lifting feel safe and understandable."

"This HIIT community makes everyone feel welcome and supported."

Good to know

1

The gym is open 24/7 for all your workout needs.

2

Expect several social events throughout the year to engage with the community.

3

Brandon offers strength classes for extra motivation and guidance.

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Fit House Denver image 1
Fitness center

Fitness center offers science-driven programs with a supportive community and a welcoming atmosphere. HIIT classes feature kickboxing and strength training in well-equipped spaces. Recovery options include cold plunge and infrared saunas for wellness and injury prevention.

Classes include HIIT, strength training, and kickboxing with well-equipped spaces for all workouts. Infrared saunas and cold plunge add recovery options alongside varied mobility sessions.

People are saying

"This gym's strength training classes are expertly programmed and get you stronger."

"The Cold Plunge community here is so welcoming and inspiring."

"Abbey's HIIT class was masterfully programmed for a great workout."

Good to know

1

Mobility classes are offered every Sunday at Fit House.

2

Kickboxing classes are popular and available for enthusiasts.

3

The facility includes recovery options like cold plunge and infrared sauna.

08
Endorphin Broadway image 1

Gym features a friendly community and small class sizes that suit all skill levels. Workouts mix cycling, rowing, and body weight moves for a full-body workout. Sessions use HIIT, Tabata, and boot camp styles with weights and bands for high intensity.

Classes combine cycling, rowing, and body weight exercises for a full-body workout. Sessions include HIIT, Tabata, and boot camp styles with weights and bands to keep intensity high.

People are saying

"This gym has the most welcoming community I've ever known."

"The cycling gym instructors are positive, encouraging, and make classes fun."

"The HIIT classes offer a great mix of exercise styles."

Good to know

1

Endorphin hosts themed classes and events once a month to foster community.

2

HIIT classes are available on Thursday evenings, often paired with social activities.

3

The gym has a strong sense of community, making it welcoming for newcomers.

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Endorphin City Park image 1

Open workout areas and 24-hour access support varied fitness routines. Classes include HIIT, yoga, and boxing, all designed to be challenging yet inclusive. A welcoming community creates a judgment-free zone for all levels.

Classes include HIIT, strength training, and boxing with options like spin, barre, yoga, and TRX rowing. Equipment covers everything needed for HIIT and weightlifting, available daily at various times.

People are saying

"The instructors at this gym are super friendly and encouraging."

"The instructors here really know their stuff and bring the hype."

"The HIIT instructors are so friendly and encouraging."

Good to know

1

Free intro classes are available to experience the gym before committing.

2

The gym offers a wide variety of classes, including HIIT, yoga, and boxing.

3

Flexible open gym hours allow for easy access to fit any schedule.

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Denver, Colorado

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