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Things To Do in Denver Suburbs

Mountain Strong Thornton Gym

4.9
98 Google reviews

Rates above the average for things to do near Denver Suburbs — one of 178 we've tracked here.

Things to Know

Mountain Strong Thornton Gym is a CrossFit and climbing gym in Thornton known for its welcoming community atmosphere and expert coaching that emphasizes technique and safety over ego, located north of Denver.

The gym's real strength is its coaches and members who deliberately create an encouraging, judgment-free environment where beginners feel comfortable training alongside serious athletes, making fitness feel like a fun adventure rather than intimidating competition.

  • Expert coaches who prioritize technique and safety over performance metrics, preventing injuries
  • Inclusive community that welcomes everyone from complete beginners to competitive athletes without judgment
  • Diverse programming including CrossFit, bouldering, climbing-specific 'Kraft' classes, and specialized clinics on skills like rowing form and climbing knots
  • Regular social events like community workouts followed by BBQs that build genuine friendships
  • Location in Thornton may be inconvenient for those living elsewhere in the Denver metro area

Based on Google reviews · AI summarized

Hours

Monday: 6:00 AM – 8:15 PM

Tuesday: 6:00 AM – 8:15 PM

Wednesday: 6:00 AM – 8:15 PM

Thursday: 6:00 AM – 8:15 PM

Friday: 6:00 AM – 8:15 PM

Saturday: 10:00 AM – 1:00 PM

Sunday: Closed

Open now

More to Do Nearby

What Visitors Say

A

Arianna Bailey Howard

6 years ago

I've been a member at Mountain Strong for two months and it's the best gym experience I've ever had. The coaches care, teach you and push you to your limits. There is a place for everyone: Crossfitters, Climbers, and anyone willing to push themselves to be better. Wouldn't want to call any other gym home!

N

Nocole Gonzalez

4 years ago

The community that Mountain Strong has been able to cultivate is wonderful. With many conditioning gyms, it sometimes can feel intimidating but not here. The coaches and owners make you feel part of their family. The members are open, friendly, and the best part, encouraging. The environment here allows your training to feel fun, that's the sweet spot in my opinion. Moving to Colorado and now been here for 2 years, 90% of my friends are from here. The gym always has phenomenal clinics to work on all types of things. From breathing, to climbing knots, to getting your rowing form perfect. They're always getting the community together for fun workouts followed by a relaxing BBQ after. I can write on and one but this place is truly magical. I am so grateful for the connections and life long friends that I have made. This has everything to do with the coaches and owners who have dedicated themselves to creating a place where your health and training can be a happy adventure. Don't get it twisted, they bring it and you will get your pump on but in a fun way.

R

Richard Pratt

10 years ago

Mountain Strong is an awesome gym! The CrossFit is great for a workout, and the bouldering wall is great to work on climbing skills. The unique climbing oriented "Kraft" workout classes are a great way to improve climbing strength and endurance. The owners/trainers are fantastic and really know their stuff, (plus they're incredible athletes in case you need someone to compete against in the workouts). The community is also really great, we're always meeting new cool people every time we go. Now if they would only move their location closer to where I live... :)

J

Justin Gritzmacher

5 years ago

The is the best gym I have ever been a member of. The coaches and other members are very supportive, encouraging, and helpful. I first started attending the gym as part of their seasonal Ski Conditioning class. When I began working out, an empty barbell was my workout weight, which made it intimidating to watch serious athletes workout around you. However, nobody judges or cares how much you can lift. Everyone is just happy to see people show up and work hard. I can highly recommend Mountain Strong!

Frequently Asked Questions

Is Mountain Strong Thornton Gym worth it in Denver Suburbs?

The gym's real strength is its coaches and members who deliberately create an encouraging, judgment-free environment where beginners feel comfortable training alongside serious athletes, making fitness feel like a fun adventure rather than intimidating competition. Known for: crossfit, climbing, and genuine community vibes.

What do visitors love about Mountain Strong Thornton Gym?

Expert coaches who prioritize technique and safety over performance metrics, preventing injuries Inclusive community that welcomes everyone from complete beginners to competitive athletes without judgment Diverse programming including CrossFit, bouldering, climbing-specific 'Kraft' classes, and specialized clinics on skills like rowing form and climbing knots Regular social events like community workouts followed by BBQs that build genuine friendships

Is there anything to know before visiting Mountain Strong Thornton Gym?

Location in Thornton may be inconvenient for those living elsewhere in the Denver metro area

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