Atly Logo
New Yorkers 1st Choice
Top picks in Colorado

HIIT workouts

Pushing through a high-intensity interval training session is the only way to clear the head.

Based on 616 Opinions
+613
User
User
User
Updated May 2026
01
HIITSQUAD image 1
HIITSQUAD image 2
HIITSQUAD image 3
View all

Gym blends energetic music with a supportive community that lifts all fitness levels. Coaches craft well-balanced workouts that challenge and engage. Trainers offer personalized HIIT plans boosting body and mind in a welcoming, family-like space.

Exceptional trainers provide personalized approaches that boost physical, mental, and emotional well-being. The encouraging community and dedicated coaches create a supportive environment for HIIT workouts.

People are saying

"This gym has an incredible sense of community."

"The HIIT coaches here push you to reach your best self."

"The instructors make you feel so comfortable and at ease."

Good to know

1

The first three classes are free for new members.

2

HIITSquad offers a variety of fitness classes suitable for all levels.

3

Expect a supportive community that encourages all fitness journeys.

02
Base6 Fitness image 1
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.

03
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.

04
BFT Highlands Ranch image 1
Fitness center

Fitness center blends science-based programming with intense HIIT sessions that mix cardio and strength. Coaches bring positive energy and motivating music. Workouts suit all levels with varied, challenging classes.

Group sessions offer intense HIIT workouts with a mix of cardio and strength training. Multiple class options keep the routine varied and challenging.

People are saying

"The coaches here really focus on your form and progress."

"The trainers at this HIIT class really push you and give individual attention."

"The fun activities here are always different and keep you engaged."

Good to know

1

The gym is clean and well-maintained, providing a pleasant workout environment.

2

Coaching is personalized, focusing on proper technique and safety.

3

Workouts are adaptable for all fitness levels, ensuring everyone can participate.

05
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.

06
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.

07
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.

08
Manic Training Highlands Ranch Gym image 1

Gym offers a supportive community with coaches like Pete joining workouts. Classes mix HIIT and strength for heart health and muscle building. Energy stays high and motivating with options for all skill levels.

Workouts include a balanced mix of HIIT and strength classes throughout the week. Coaching by Pete adds a fun and varied element, helping improve cardiovascular health.

People are saying

"It's so fun with all the social outings and happy hours."

"These HIIT classes made me stronger and prepared me for activities outside the gym."

"The yoga classes here are varied and challenging."

Good to know

1

The gym offers a variety of classes, including HIIT and yoga, for all fitness levels.

2

Parking is ample and easily accessible from the County Line Rd entrance.

3

Classes can be booked easily through the gym's app.

09
Unite Fitness Group Training Golden image 1

Fitness center offers an intimate space with upbeat energy and a welcoming community. HIIT classes feature varied workouts led by local instructors in a supportive group setting. Studio blends strength and yoga for balanced training and recovery.

Varied high-intensity interval training workouts target different muscle groups. Local instructors lead classes in a supportive group setting. The studio combines HIIT, strength, and yoga for balanced training and recovery.

People are saying

"The gym classes are challenging, unique, and always worth your time."

"The weight lifting gym community here is so supportive and positive."

"The HIIT instructors' high energy and coaching made my workout incredible."

Good to know

1

Unite Fitness offers a variety of group weight training classes throughout the day.

2

Classes include high-intensity interval training (HIIT) and restorative options.

3

Instructors are knowledgeable and provide modifications for all exercises.

10
VASA Fitness image 1

Huge gym offers Studio Red HIIT classes led by expert coaches. Spacious areas include a pool and sauna for recovery. Friendly vibe and multiple amenities make workouts enjoyable and varied.

Classes include Studio Red HIIT and Aqua Extreme, offering varied intensity. Coaches Jennifer and Kristina lead sessions with strong guidance. Memberships often cover access to both HIIT and Infra-Red hot yoga.

People are saying

"The staff at this gym are so friendly and attentive."

"The yoga instructors here are phenomenal and bring their own persona."

"The HIIT coaches are so motivating and knowledgeable."

Good to know

1

Cassie's Zumba classes on Tuesday and Thursday at 6:30 pm are always full.

2

The classes include Zumba and HIIT.

3

VASA Fitness can definitely get busy during peak hours.

11
Cerus Fitness image 1

Gym offers intense HIIT sessions and high-quality equipment for all fitness levels. Boxing classes bring high energy and challenge while the space fosters a supportive community that welcomes everyone. Open all day, it suits both group and solo workouts.

Classes include HIIT, CrossFit, Cycling, Pilates, and Boxing. HIIT sessions focus on intense workouts that get a solid sweat going. Boxing and HIIT classes stand out for their energy and challenge.

People are saying

"This gym's community makes you feel like family."

"I loved their boxing and HIIT classes; the coaches really cared."

"The instructors at this Yoga Spot are fantastic and passionate."

Good to know

1

Cerus Fitness offers a variety of classes including HIIT, CrossFit, and yoga.

2

Early morning classes are available for those with busy schedules.

3

The gym hosts fun events and challenges to engage members.

12
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.

13
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.

14
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.

15
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.

16
HOTWORX - Colorado Springs, CO - Dublin image 1

Infrared heated saunas offer a warm atmosphere with small class sizes for personalized workouts. HIIT sessions blend intense exercises with yoga inside the sauna for a unique fitness experience. Members enjoy 24/7 secure access and a laid-back, respectful vibe.

Infrared heat combines with HIIT classes to create intense, efficient workouts. Sessions include yoga and isometric exercises inside a sauna environment for a unique fitness experience.

People are saying

"The infrared saunas here made me feel incredible."

"This gym's staff is super friendly and encouraging."

"I felt so welcomed and appreciated during my HIIT session."

Good to know

1

Classes are available 24/7, fitting various schedules.

2

The facility is always clean, with staff cleaning at all times.

3

Membership cancellation requires a $100 fee and in-person visit.

17
212 Performance Gym image 1

Gym offers a friendly community with top gear like the air runner treadmill. HIIT classes mix strength training and cardio, blending Crossfit and weightlifting. Indoor and outdoor spaces keep workouts fresh and motivating.

Classes focus on HIIT workouts combined with strength training and bodybuilding. The gym blends Crossfit and weightlifting styles, offering cardio equipment and personal training.

People are saying

"My trainer challenged me with new workouts and helped me make progress."

"I loved the outdoor functional space as an extension of the training area."

"The HIIT community here is so welcoming and focused on improving well-being."

Good to know

1

Memberships are month-to-month, making it flexible for short-term users.

2

The gym is open 24/7, allowing for workouts at any time.

3

The facility is very clean and well-maintained.

Discover more

Colorado

Area guide
Loading Map...