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New Yorkers 1st Choice
Best of Thornton

Gyms

You need a gym that fits your routine without the unnecessary friction of a crowded floor.

Based on 456 Opinions
+453
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Updated May 2026
01
Adventure Fitness Athletic Club image 1
Adventure Fitness Athletic Club image 2
Adventure Fitness Athletic Club image 3
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Large gym space features top-notch equipment and state-of-the-art amenities like cryotherapy. Cleanliness and organization create a welcoming atmosphere with no crowd. Talented coaches and group classes build a supportive community that motivates all.

Cleanliness stands out with well-maintained spaces and equipment. Talented coaches provide good support, and the gym offers a full range of equipment in a welcoming environment.

People are saying

"I found the gym to be spotless and organized."

"The staff's energy is motivating and they genuinely care about your success."

"This cryotherapy helped me pitch pain-free after just one session."

Good to know

1

The gym offers a wide variety of classes every day.

2

The facility is known for its cleanliness and well-maintained equipment.

3

Expect a friendly atmosphere with supportive staff for all fitness levels.

02
CrossFit MOB image 1

Huge gym with well-maintained equipment and clean locker rooms offers a spacious, welcoming space. Warm community hosts group workouts and fun events like hikes and documentaries. Everyone enjoys supportive atmosphere focused on proper form and inclusion.

Facility stays very clean and well-maintained with good equipment and locker rooms that include showers. Community events like hikes and documentary viewings happen outside workouts.

People are saying

"The coaches at this CrossFit Gym are so welcoming and helpful."

"The coaches at this gym are super knowledgeable and invested in you."

"The bathrooms here are clean and have showers."

Good to know

1

The gym is clean and well-maintained with good equipment.

2

Coaching quality is high, ensuring effective workouts.

3

The community is supportive and encouraging for all fitness levels.

03
Champion Boxing image 1
Boxing gym

Small gym with a strong community and welcoming atmosphere fuels intense cardio and boxing fundamentals. Training suits all ages and skill levels, creating a family-like support system. Energy stays motivational and competitive throughout sessions.

Strong sense of community and support creates a family-like atmosphere. The gym offers life-changing boxing training that helps people turn their lives around.

People are saying

"The boxing community here is so welcoming and supportive."

"This gym feels like a welcoming community and a second home."

"It's so Kid Friendly; the coaches are super attentive to the children."

Good to know

1

Membership costs $150 a month for three classes per week.

2

Drop-in sessions are available for $25 each.

3

Classes are effective even without sparring.

04
CrossFit ELM image 1

Gym offers well-maintained facilities and expert coaching with detailed movement breakdowns. Atmosphere stays welcoming and inclusive, promoting body positivity and personalized attention. Community feels friendly and motivated, supporting all fitness levels.

Coaching stands out with detailed movement breakdowns and expert guidance. Facilities support a strong CrossFit experience with a focus on quality training.

People are saying

"The weight lifting coaches here tailor workouts to your specific needs."

"Brandon was a phenomenal coach who guided me through every step."

"The coaches at these gyms are knowledgeable and always encouraging."

Good to know

1

CrossFit ELM offers a Foundational course for beginners to learn fundamental moves.

2

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

3

CrossFit ELM provides personalized coaching and attention during classes.

05
F45 Training North Thornton image 1

Spacious studio offers well-maintained equipment and a wide selection of weights for varied workouts. Classes bring high energy and awesome coaches who create a motivating, inclusive vibe. Strong community support keeps everyone engaged and consistent.

Classes focus on high energy and community support with awesome coaches leading every session. The gym fosters strong consistency through engaging workouts and a welcoming atmosphere.

People are saying

"The coaches at this weight lifting gym are so motivating and friendly."

"The coaches at this gym are so fun and motivating."

"These fun activities are challenging and a lot of fun."

Good to know

1

Classes last 45 minutes to 1 hour, maximizing your workout time.

2

Workouts can be modified for all fitness levels, making them accessible.

3

The studio fosters a strong community vibe, encouraging consistency.

06
Orangetheory Fitness image 1

Gym boasts state-of-the-art equipment and a supportive community that fuels passion for workouts. Team training style offers a fresh, engaging experience. Staff are friendly and welcoming, creating a strong community vibe that motivates every visit.

Offers a supportive community focused on achieving health goals. Provides a team training style workout that differs from typical gym experiences.

People are saying

"The coaches at this gym are amazing and super motivating."

Good to know

1

Orange Theory Fitness Thornton caters to all levels, providing challenging workouts tailored to individual needs.

2

The variety of class types and times ensures there's something for everyone, keeping workouts exciting and effective.

3

There was plenty of parking available.

07
Flow Vault Parkour and Ninja image 1

Gym blends safe training with engaging coaching for all skill levels. Classes pump punk remix soundtracks creating high energy. Focus on parkour and ninja training draws kids and adults alike.

Focus centers on parkour and ninja training with skilled staff guiding skill development. The gym offers a unique environment not easily matched elsewhere.

People are saying

"The coaches here are amazing and keep all the kids engaged."

"The coaches at this gym are amazing at engaging and challenging kids."

"The coaches here are the best at giving instructions and advice."

Good to know

1

Flow Vault offers classes for all skill levels, ensuring everyone can participate.

2

Safety is prioritized, with coaches ensuring kids only attempt skills they are ready for.

3

Adult classes are available, making it a versatile gym for all ages.

08
The Spot Climbing Gym image 1
Rock climbing gym

Old school gym with 5 autobelays and a bouldering area offers solid routes for all levels. Laid-back vibe and quiet peak hours make climbing relaxed. Bizarre lighting affects hold visibility but adds to its unique charm.

Offers 5 autobelays, a bouldering area, and a lead wall with many overhanging problems. The gym stays quiet during peak hours and has a laid-back, old school vibe with solid route setting.

People are saying

"The staff at this rock climbing gym are super friendly and helpful."

"The climbing gym's route setting is fantastic and dynamic."

"I found this gym had a great old school vibe."

Good to know

1

The gym offers free climbing classes for kids during open house events.

2

Discounted day passes are available on Mondays and Wednesdays.

3

The gym has 5 auto-belays for beginners or those without a belay partner.

09
Chuze Fitness image 1
Fitness center

Fitness center shines with clean facilities and a friendly atmosphere. Equipment variety includes extra squat racks and a welcoming daycare. Space feels cramped but supports complete workouts with sauna and pool.

Cleanliness stands out with consistently clean facilities. The gym offers great equipment options including extra squat racks during busy times and a welcoming daycare for children.

People are saying

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

"The steam rooms and saunas here are always clean and working."

"The Kid Friendly zone here is great and well-run."

Good to know

1

The gym is usually clean and well-maintained.

2

Expect the gym to be busy after 4 PM.

3

Some equipment has been broken for an extended period.

10
Gold's Gym image 1

Gym offers 24-hour access with top-notch equipment and a quiet atmosphere at night. Separate saunas for men and women keep it comfortable. Cleanliness and a salt dry sauna make it ideal for serious trainers and late shifts.

Open 24 hours with a quiet atmosphere at night suits late shifts well. Machines are top notch, the gym stays clean, and a salt dry sauna adds a nice touch.

People are saying

"The weight lifting gym has amazing, top-notch equipment."

"The gym equipment here is top-notch and amazing."

Good to know

1

Gold's Gym is open 24 hours for members.

2

The gym gets packed, especially during peak hours.

3

The app for entry sometimes doesn't work properly.

11
Thornton Community Center image 1

Facility blends open flow design with quiet spaces for study and exercise. Gym features upper and lower courts and common equipment. Library and gym connect seamlessly, while makers space and skate park add versatile community hub appeal.

Half the building offers a gym with upper and lower level courts and most common equipment. The design flows openly from the gym to the eating area and library, using the same pass as other centers for entry.

People are saying

"I loved the open flow from the library to the other areas."

"It's a great place for studying and work."

"I was really impressed with this beautiful community center."

Good to know

1

Monthly passes for residents are very affordable.

2

The gym uses the same Thornton pass as other recreation centers for entry.

3

The library and youth area are accessible for free.

12
X Gym image 1

Facility offers 24/7 access with top-tier equipment that stays clean and well maintained. Friendly staff foster a welcoming atmosphere and strong community vibe. Gym rarely gets busy, so machines are easy to use without waiting.

Clean, well-maintained equipment fills the gym, available 24 hours for flexible workouts. Friendly staff and a welcoming atmosphere create a strong sense of community and support for fitness goals.

People are saying

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

"The personal trainers at this weight lifting gym are knowledgeable and encouraging."

"This Local Spot's 24/7 access is perfect."

Good to know

1

X Gym is open 24/7, which is beneficial for irregular work hours.

2

The equipment at X Gym is clean and well-maintained.

3

X Gym has a wide variety of equipment to suit all fitness levels.

13
Planet Fitness image 1

Gym features spacious locker rooms and a large variety of equipment in a clean, well-maintained space. Atmosphere is non-judgmental and chill, with no overcrowding and a focus on safety. Staff monitor phone use to keep members focused.

Cleanliness stands out with the gym being consistently well maintained and organized. Equipment quantity matches the gym size, creating a comfortable and inviting atmosphere.

People are saying

"The gym staff here are always so friendly and social."

"The staff at this weight lifting gym are so friendly."

Good to know

1

The gym is very clean and well maintained.

2

There is a large parking lot for trucks in the back.

3

The showers have hot water available.

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Thornton, Colorado

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