★ 5

Would highly recommend this facility to anyone in the Boston area. The staffs effort to maintain the facility and to create the most positive experience for members is absolutely second to none.

Source: Google

★ 5

Great gym. It has everything you need for strength and cardio. There’s also plenty of squat racks, benches, dumbbells, etc so you aren’t waiting around for something to open up. I also really appreciate all the additional attachments and accessories. Lastly, the sauna and ice bath make for great recovery.

Source: Google

★ 5

Source: Google

★ 5

Super cool gym in Boston with new equipment

Source: Google

★ 5

Mass Underground is a great gym for motivated fitness people with no feelings of competition or judgement. It is a smaller gym, but provides essential work out equipment including recovery amenities like a recirculating ice bath and a barrel sauna. Stephen (the owner) is hands on with the business and has it cleaned regularly. If you are looking for a reasonably priced gym, with recovery amenities, and a motivating environment, this is it.

Source: Google

★ 5

All you could want in a gym! I was a member for almost 2 years, sadly moved out of town so had to leave it. The flexible hours were perfect for the busy scheduled human. Ample space with a variety of free weights, racks, cardio equipment and much more. The best part was that the membership included the sauna and cold plunge for optimal recovery!! The owner Steve is great, very communicative and actively on site in case needed. Highly recommend this gym to anyone looking!

Source: Google

★ 5

Hands down one of the best gyms I’ve ever been a member of/ trained at. Stephen, the owner, makes you feel welcome from day one and has created an environment that truly helps you level up. Top-tier equipment, machines for every muscle group, an amazing sauna, and a no-gimmicks ice plunge that’s elite. If you’re serious about your training, this place is a no-brainer.

Source: Google

★ 5

Cannot recommend this club enough! Great atmosphere, top of the line equipment and the owner (Stephen) is incredible to top it off. Whether you're an experienced lifter, or someone just getting started, Mass Underground is the place for you.

Source: Google

★ 5

After living in Boston for 4 years and trying many gyms, this is my all time favorite. Steven is great and I am obsessed the the Box classes. I cannot recommend this place enough.

Source: Google

★ 5

Could not speak more highly about this gym. If you’re looking for a small community of people, who are all passionate about growing themselves physically & mentally then Mass Underground is the place for you. This gym has everything you will ever need to get you to where you want to be inclusive of sauna and cold therapy, and Steve the owner is awesome and extremely welcoming. When I move back to Boston, I can’t wait to come back here!

Source: Google

★ 5

Been a member of a dozen or more gyms in the Boston area and this has been the best one by far. Highly recommend to at least take a tour and check it out.

Source: Google

★ 5

A gym so good, you’re tempted to want to keep it a secret. Top notch equipment. Cool amenities like sauna, ice bath, and turf. Clean lockers and showers, and not too crowded despite the relatively small space. Have never had to wait for equipment to open up. It’s open long hours with a friendly owner. Lots of membership options.

Source: Google

★ 5

Source: Google

★ 5

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★ 5

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★ 5

Source: Google

★ 5

Source: Google

★ 5

Source: Google

★ 5

The exact type of gym I have been looking for but didn't exist until now. Great location, local owned, affordable monthly pass & all the equipment you would need to get a killer workout in. Local owner is easy going too.

Source: Google