I signed up recently and I can say I finally found a gym environment that has everything I need, great equipment, very clean, and the girl at the front is super nice , overall great gym

Excellent gym, very clean and with a great variety of weights, machines, turf, and classes. Also the employees are very helpful and nice.

This is no longer a 24 hour gym, which is why I joined in the first place. It is constantly full and you have to wait for machines constantly. Too busy, too packed, not 24 hr as advertised. Also, the gym etiquette is horrible here. People leave weights wherever they want, people take 2 machines simultaneously and rarely clean after themselves.

I love this gym I’ve been a member for years !! Clean and everyone is friendly and they have best Zumba instructors in Fairfield county !!❤️

Amazing space and atmosphere! One of the last real body building gyms left in Fairfield county. Great trainers!

Thank you Shane for the awesome gym. Never a bad experience here. Every time I come in from out of town, I come to this gym and feel at home. I told my sister about Underground and she chose to join after my recommendation. She loves it too! I would never choose another gym. Great spot, great equipment, great experience and very convenient.

Going since high-school and even brought my fiance along too! Love the yoga classes and the staff is super professional. Jonathan always greets us with a smile & remembered our names.

Coming to this gym has been the best decision I have made and I highly recommend coming here rather than the other local gyms. The staff is awesome and makes you feel like your at home, it’s always clean, and of the hours are the best part!

Good afternoon. Underground Fitness is a high rated gym and facility that caters to all walks of life in the fitness/health industries. The owner, staff and maintenance are second to none. The folks that work out at this gym are like a family. Peaceful environment, cleanest gym in Stamford. I highly recommend Underground Fitness for your gym and heath goals! KM

Love the gym! Been coming here for years. The staff is incredibly nice and helpful with whatever you need. They offer so many different cool classes. Great to come with your friends and have a good workout!

I really like this gym. I’ve been there early morning and after work and it’s not as crowded as some of the other local gyms. They aren’t perfect. So if you’re looking for a powerlifting gym this is probably not it but if you just want a place to get your lifts in before/after work and aren’t trying to set up a tripod and be all cutesy for the gram you should check out underground. If you are trying to set up a tripod and are only concerned with looking cute and taking pictures then maybe go somewhere else. Not enough squat racks for that nonsense. Took a star away for the number of power racks and the fact that staff don’t seem to do any cleaning or organizing. People don’t re rack their weights so it can get a little annoying if you are the type that does and doesn’t want to search for 45’s every session. Having staff spend even 30 minutes a shift casually putting stuff back would have a tremendous impact but again…. I’m just there to lift so it’s whatever. Check it out…. Or don’t.

Best gym in Fairfield County. Have been a member here for 4 years and have always been happy with my experience. Friendly staff, clean gym, great machines. Bravo! Ask for Johnny Wave at the front desk he’s a great guy.

I’ve been coming here for 5 years now and it hasn’t let me down once. The gym is kept clean and staff is always welcoming. No complaints.

This is the best gym in the entire Fairfield county. The equipment is always clean and in order unlike other gyms around here *cough cough* LA Fitness. The staff there is always nice and welcoming. Jonathan is the best, make sure to say hi to him. They also have an amazing pendulum squat that is to die for. No leg machine in Connecticut can match it!

I’ve been a member for a little over a year and the gym is very clean, the members are chill, and the staff are always willing to help out. There is a solid assortment of equipment. Even during the busier hours, wait times are not long for a machine or a bench.

Been coming here for years. Comfortable, neat and the setup helps you wanna work out more. HOWEVER, they're no longer open 24hours and no longer allow guest, which is a BIG BUMMER. I don't usually bring guest but it's nice to be able to bring a work out buddy once in a while. I don't know any other gyms that don't allow guests. Also, it gets crowded at night time, so that limits the equipments availability and personal space...

i’ve been going to this gym for a few months now and i absolutely love it! the environment is super clean and the vibe is incredible!! it’s unlike any other gym because people actually come here to workout.

I joined this club not long ago, and am very happy with it. They have a friendly atmosphere, the latest equipment, well maintained and clean, and very accommodating staff.

I moved to Stamford CT in 2016 and Underground Fitness has been my second home since I moved here. Underground is the best gym in the area with the absolute best price, hours, and great equipment. It’s also a independent gym and the owner will take action to request on new equipment and attachments.

The staff is amazing all around, friendly and really out going. The environment is not overly crowded, I am able to use many machines without any hassle. It’s always maintained well and clean. Best part is the late night hours! No other gym can compete with that!

Wanted to try the gym for a day or even a hour and work out with the equipment to try the gym but the gym doesn’t offer any type of day pass. The staff was very rude when I called and gave a lot of attitude.

Underground fitness is a great gym. I love it here. I’ve lost about 20 pounds in just 2 months of working out here. The staff is very polite and I am always greeted when I walk in. The gym equipment feels new and overall the gym has a great look. My trainer Tristan is also very nice. He is one of the best trainers he helped me loose so much weight in such a short period of time. He is the best and I would definitely recommend him when you go. Overall great gym great staff and great trainers.

Great gym, has everything you need with new equipment. Nice staff and always look forward to going!

Been going here for a little over a year, the gym has all the equipment you can think of for a full body workout. Be sure to check out some of the weekly classes offered, they’re fun. Love the hours, it makes even the busiest person still be able to fit in a work out with a busy schedule.

Best gym ever! Feel welcomed everytime I enter as well as the gym always being clean!

Come May 2023, 12 years later and I am still at this Gym. You can't say that about many gyms around this area. Great facility and members that have become like family. Constantly updating their equipment. New floor and barres in the Group X room. Love the selection/offerings of Group X classes. Fantastic Instructors and Trainers. Would recommend over any Gym in Stamford, CT.

Good gym, does not stay open 24 hours though and in the past guest were allowed where as now we are barred from bringing any. Seems steep for the monthly membership fee

I’ve been a member of underground for The last five consecutive years and I love it. It’s such a great hometown gym. It has the equipment you need to complete your work out, offers classes, and in the mornings before work it’s never busy so it’s a great time to get your workout in !

Been coming here for a few years after moving. Amazing gym with incredible staff. The facility is always clean and everyone just makes you feel welcome. Definitely recommend checking it out and they tanning beds which is a plus.

Amazing Gym and it’s affordable! Not a lot of people so you’ll most likely have your workout station to yourself. All equipment are new and they assist you with your exercise to perfect your form! Love this gym!

Absolutely love this gym. I’m new to Connecticut and needed to find a gym. Haven’t been upset with my decision yet. The gym is super clean, equipment is very up to date and the staff has made me feel more than welcomed.

I have lifted in many different gyms throughout my life and this is by far my favorite. The trainers and staff are very friendly and everything is clean. It is a very nice environment to work out in and there are plenty of machines and weights for all levels of lifting.

Great gym for the new and experienced. Opened almost 24 hours a day so it’s easy to find time to work out. Staff is also very kind.

I have trained at many gyms over the last 17 years. Underground is by far the cleanest and most organized gym, also "most complete" in the Fairfield county area. I highly recommend anyone looking for a gym to come here and take a look. Happy member. 💪

I recently moved here from out of state and have been looking for a gym that fits my needs. Underground is an amazing space to lift and everyone there is super friendly. The price point is great for what you get!

Underground is the best gym around, especially since they are open all the time. Being able to wake up and hit the gym first thing in the morning is great. Every machine you will need is operable!