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    Boston Underground Strength Training

    4.9 (30 reviews)
    Closed • 6:00 am - 9:00 AM, 4:00 pm - 7:30 PM

    Services - Boston Underground Strength Training

    Personal training

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    Ask the Community - Boston Underground Strength Training

    Review Highlights - Boston Underground Strength Training

    “Angel, John, and Lyda are great trainers, and they are so passionate about everyone's form and personal health.”

    Mentioned in 23 reviews

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    CrossFit City Line - The Warm Up nook.

    CrossFit City Line

    5.0(63 reviews)
    1.6 mi

    This place is 5 out of 5. If I could give it more stars I would…read more CrossFit can be intimidating but the staff here is extremely welcoming and warm. They will correct you if your form needs adjustments and will really encourage you throughout the class. I loved the culture where you have a circuit and if you finish earlier than your peers you cheer them on until they finish. I also want to give a special shout out to Coach Laurel who introduced me in the beginning of class to give me a warm welcome. She remembered that I was visiting from Long Beach and was here for the week in Boston and traveling to Vermont. I highly recommend to anyone who is interested in CrossFit. I loved it so much I even bought a t-shirt.

    I've been a part of the CityLine community for almost 2 years now. Wow! The community, coaches,…read moreWODS, etc standout and are one of a kind. As someone who is an introvert and struggles with confidence (especially in the gym) the coaches go the extra mile to make me feel comfortable and prepared for each workout by providing modifications and words of encouragement! During COVID-19 I have had some of my biggest gains in virtual WODS with the chance to work on skills like pushups and double unders. While I am still transitioning back to the gym in person full time I have attended a few outdoor classes. CityLine continues to prioritize and maintain the health and safety of all their members while putting you through a hard workout and building community at the same time. I look forward to the at home WODS and going in to the gym every chance I get!

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    CrossFit City Line - Mobility sesh.

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    CrossFit City Line - Climb your way to success!

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    Planet Fitness

    Planet Fitness

    3.0(115 reviews)
    2.0 mi

    The renovations of Aug 2026 are terrible, there was a yoga ,stretching and floor exercise area that…read morewas big and the best of any planet fitness or of most gyms . Couples or groups could work out together and many did at different times during the day it was full of people doing floor exercises . Now you need to squeeze in between machines or racks . It seemed that they intentionally made floor exercises especially with partners or friends uncomfortable . Why did they put racks of weights in the middle of the stretching area floor where normally it is put on the side , which had space . Doing that They eliminated at least 4 spaces for people to do mat exercises. They put in a bench press area eliminating the yoga area where it could have replaced one of the smith machines . The bench press is healthier than a smith machine . They replaced a number of the lay back bikes which was very popular with regular stationary bikes which doctors and therapists say are not good .

    During a month-long work trip to Cambridge we indulged in Boston's superb culinary scene. Because…read moreour caloric intake upticked it was essential to find a gym for us to work off all those extra drinks and desserts. The nearest gym to our temporary residence was the Planet Fitness in Waltham and we could not have been more pleased. We want to thank the manager, Chan, and his staff for making us feel welcome and accomodating us for a short period membership. The Planet Fitness offers a full suite of both cardio and strength equipment that addresses all of workout requirements. And there is ample duplication to enable a large number of patrons to burn off excess calories, stress, and energy. This gym is well maintained and the staff was noticeably making rounds to ensure proper functioning and cleanliness. When repairs to equipment were needed it was usually accomplished within 24 hours. The gym hours are great and meshed nicely with our hectic schedule. Weekday hours are from 5:00 am until 10:00 pm which ensured we could get in a daily workout. The patrons here are very friendly and and we enjoyed the social dimensions of being in the gym. We also noted that everyone is meticulous about cleaning the equipment after completing a set. Great facility with a wide variety of equipment and an attentive staff and genial patrons made for an exceptional experience. We want to thank Chan and his team for making Planet Fitness our travel gym in Boston!

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    Planet Fitness
    Planet Fitness
    Planet Fitness

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    Planet Fitness

    Planet Fitness

    2.9(61 reviews)
    1.7 mi

    On 8/14/26, the men's locker room smelled so strongly of body odor, body spray, cologne, feces, and…read moreurine that on my way out I asked the front desk, "Any chance y'all forgot to turn on the exhaust fan in the men's locker room?" I was told there isn't one. No wonder I'm holding my breath every time I go in there. (The staff here are genuinely wonderful and unable to fix this issue because it's above their paygrade.) I was considering upgrading my membership so I could bring my brother. He's asthmatic, and I'm not bringing him into that room. I doubt it's good for anyone to spend more than a few minutes in there. I am not a lawyer or a building inspector, but this was upsetting enough that I called the building inspector and left a message naming the gym and describing what I experienced and what staff told me. Due to price and location I'll keep coming to this gym, but I will no longer be using the locker rooms, and it's infuriating to pay for a full membership when I can't use the full facilities because of inadequate ventilation. When I posted this review on Google Reviews, I got a reply from the owner that just invited me to reach out to staff with any concerns. Talk about a cookie-cutter, tone-deaf reply. I already did reach out to your staff when I alerted them to the issue. You're now aware (let's be real, you already were aware) that there's not proper ventilation in the men's locker room. If you resolve the issue, I'll update my review, but to suggest that solving this issue requires me alerting more of your staff to the fact that there's not proper ventilation in the men's locker room is absurd.

    Maintenance is a problem, whether it is flashing fluorescent lightbulbs for two weeks, or machines…read morebroken for six weeks. Employees are treated badly from above, they can't help us. It's time for everyone to quit until these crypto losers get a grip.

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    Planet Fitness
    Planet Fitness
    Planet Fitness

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    Waltham Athletic Club

    Waltham Athletic Club

    2.9(49 reviews)
    1.5 mi

    I have been a member here for a few years and would recommend that if you are looking for a gym,…read morelook elsewhere, such as Planet Fitness or Waverly Oaks Athletic Club. This place is affordable for the area, but the fitness area is lacking. They have the basics and some machines, but the area is not maintained, and things often go unfixed for many months at a time. It is clear that the club makes all of its money from the Tennis and Pool centers and caters to those areas. On one occasion, one of the cable machines was broken, and a member took the part home to weld it back together, knowing that management was never going to fix it. On another occasion, the hammstring curl was broken and out of order for more than 8 months. There is a sauna and steamroom in the men's lockerroom that have not been turned back on since the pandemic. Overall, the fitness area is serviceable but dated. The positive is that there is a small group of members, so there is almost always space available. The membership is very nice and welcoming for the most part; there is one unstable person who slams equipment, and management has not held him accountable.

    We have to enter this club because my daughter is a swim student…read more Aside from having awfully outdated dusty ugly facilities, the staff and manager specifically is very rude, doesn't greet you and they were both rude to us and my husband who is a member questioning his membership when we went to say hi to him. In the waiting area apparently you are not allowed to actually wait. It was a jail type of treatment. I wish the swim academy will move. It's painful going there each time.

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    Waltham Athletic Club
    Waltham Athletic Club
    Waltham Athletic Club

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    Boston Underground Strength Training - healthtrainers - Updated September 2026

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