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Open 24 hours
28B Nashua Rd, North Billerica
Gyms
“I think my choice of going from yoga to power lifting speaks volumes for the gym and the coaches. Ashlyn is terrific -- warm and hard driving at the same time. She won the 2023 MA power lifting championship, and her coaching is focused on the techniques that over time mean the difference between injury and progress. Coming to the gym has been the highlight of my week!”
5AM - 7:45PM
534 Boston Post Rd suite b, Sudbury
Gyms
“I rejoined in September 2023 after being away for a few years during the pandemic. The coaches and staff are great. The workouts are hard for me but they are making me stronger. There is always a good variety in each workout. I like being able to use the data to motivate myself. I would never do these exercises on my own. I appreciate the accountability. They just added strength and tread classes which are great. Some of the coaches have been there for many years. I appreciate the consistency.”
“I cannot say enough great things about D1 - from their workouts, their facility, their staff everything has been amazing. I have learned so much regarding nutrition and exercising that I never knew before (and I was a dedicated high school athlete). If you are looking for a gym that is personable and really dedicated to you this is the place to go! The owner of the gym is even involved in the workouts every day! I highly recommend giving D1 a try - you won't regret it! It is a true investment in yourself and your health journey.-Katie Morales”
4:30 - 7:30PM 6 - 9AM
235 High St, Waltham
Gyms
“I had just moved to the area and was looking for a new gym back in October. Boston Underground was the perfect fit. The strength camps work best for my goals, and the coaches have all been amazing. They make you feel like part of the family from the start and provide individual attention to help you perfect your movements and get the most out of your workout.”
“I am not the most athletic guy, but I've been coming here for almost two months to do the "Punches and Crunches" class. What I have found is a gym full of supportive, passionate, and motivated people who want everyone around them to succeed. You should give this place a shot, even if the idea of a boxing gym is intimidating for you!”
“Edit: I was able to teach a compromise, I had no issue with the gym itself and will say the trainers are fantastic, it was mainly an issue with the payments which was resolved.”
5:30AM - 7:30PM
290 Moody St, Waltham
Gyms
“I love being at spin classes here! Pre-pandemic, I was in a 5-morning-a-week routine at my workplace gym with a fun instructor and a great little crew. Coming to FireCycle for morning classes has revived my energy and enthusiasm for getting out of bed each day! I didn't realize how much I truly missed this kind of great cardio workout. It's a welcoming place with great instructors and it is CLEAN...I mean CLEAN. It is cleaner than pretty much anywhere in my house and for sure any gym or even restaurant I've ever been to! It's so easy to just drop in, hop on a bike with your water bottle, and get into whatever dance music or mashup the instructor has cued up. They provide towels and even a shower (did I mention how clean this place is?). Lots of street parking available for early morning classes. Come join the fun and get into a great healthy new routine!”
5:15AM - 7:30PM
40 Jones Rd, Waltham
Gyms
“This review is long overdue. I couldn’t think of how to express my gratitude for this place without sounding like a complete cliche. I’ve always been into fitness- rec leagues, orange theory, barre and traditional gyms. I would go in- be on my phone til my workout started and then head out with a quick wave.
Tilt has broken me of that and made fitness a way to connect with people- not escape from them. It’s been a community for me when all my family is out of state and hours away.
There is something for everyone- the environment is supportive not competitive. Definitely give it a try!”
5:30AM - 8PM
12a Mica Ln, Wellesley
Gyms
“Anytime I am in the area, FitClub is my go to for working out. Not only do the coaches pay attention, push you, and help you accomplish a great workout, the community itself is fantastic as well. I would recommend FitClub to anyone.”
5:30AM - 8PM
930 Main St, Acton
Gyms
“I highly recommend Mason if you are dealing with an injury that's interfering with your training. I've had recurring lower back and shoulder pain over the years. I met with Mason and he identified the movement patterns contributing to the pain, took the time to explain why I would be feeling pain, and created a warm-up program to address the root causes and allow me to move more freely in my workouts and in everyday life. Thanks Mason!”
“The best gym I have ever been to! It has a climbing area, basketball court (they also play volleyball there), racquetball courts, multiple table tennis boards, fitness classes, fitness assessment room, powerlifting area, CrossFit area, stretching area, weight machines and cardio room, private family rooms with cardio machines, indoor track, and so on. There are tennis courts, soccer, and baseball fields near the gym with outdoor running track. They offer free classes and multiple gaming/sporting/health events. They also have weekly club events. Lots of free weights and squat racks are usually available. The gym is clean and spacious. This is my favorite gym!”
Open 24 hours
139 Littleton Rd, Westford
Gyms
“The 6-week challenge had a significant impact on my focus regarding a balanced diet. The personal workout sessions with Trainer Brett were truly enjoyable. Brett understood my pace and adjusted the workouts each time, which made the experience even better. Additionally, Zack, the operations manager, was highly motivated to help me achieve my fitness goals, both in terms of workouts and diet. Overall, my time with Become Fitness has been wonderful, and I plan to continue with them.”
6:30AM - 6:45PM
423 Great Rd, Acton
Gyms
“*****2nd Review written in September 2025.. I successfully finished the AV1 in the Dolomites this summer. I am grateful to Jazzercise for adequately preparing me for this physically demanding hike. As someone who does not typically hike, like myself, having completed two successful 10-day intensive hiking trips in Europe, I strongly recommend Jazzercise to individuals who are preparing for hiking.
****1st Review written in February 2025. Since joining Jazzercise Acton Center in 2018, I've achieved a great level of physical fitness. Jazzercise has enabled me to tackle challenging hikes, including a 10-day Tour du Mont Blanc hike through France, Italy, and Switzerland in 2023. I'm looking forward to another 10-day hike in the Dolomites, Italy this summer. I'm grateful for the wonderful and supportive Jazzercise teachers and classmates. As always, l love to go to the classes.”
4 - 8PM 6 - 10AM
7 Summer St #5, Chelmsford
Gyms
“9Roundin Chelmsford is easily the best gym out there. Not only is the workout incredible but there is no better seratonin boost than spending a morning with trainers Jaime "Bustah" and "Wild" Bill. They make workouts so much fun, but still leave you feeling accomplished, strong and badass. I still drive over an hour to go workout there when I can. If you're looking for a gym, go here - you absolutely won't regret it.”
“Absolutely love Btone!!! It is my favorite way to workout and completely worth any membership fee. I am a college student and I feel a genuine difference when I come home from school and switch my typical workout to Pilates at Btone. If you are looking to get toned, be challenged, and feel your best join Btone!!!”
5:30AM - 8:45PM
993 Watertown St, West Newton
Gyms
“I'm a Starting Strength member from Indiana and was able to get a lift in while visiting. Gym was clean, well lit and spacious. The coaches are friendly and knowledgeable. If I ever moved to the boston area this is where I would lift.”
5AM - 7:15PM
475 Boston Rd, Billerica
Gyms
“By far my favorite gym! The owners awesome and hands on. 24 hour access for members, multiple options for programming, classes, or work out on your own. I would highly recommend this gym!!”
3:30 - 8PM 5 - 10AM
13 Wall St, Waltham
Gyms
“Membership at Flight is worth its weight in gold. The staff are knowledgeable, friendly, & work hard to provide individualized attention for everyone in the gym. I am a local rugby player and the fitness programs I received were tailored to my on and off field goals and developed as I did throughout the season: injury prevention and recovery, increased flexibility, speed work, etc.Great community, great coaches, great space. Get to Flight!”
5:30AM - 8PM
60 Union Ave, Sudbury
Gyms
“Awesome gym run by people who go above and beyond every day. Expert and insightful coaching. Fun and inclusive community. Diverse schedule that includes CrossFit classes, yoga, and cycle. My teenaged daughter and I joined as workout buddies (they take kids aged middle school and up!) and we have gotten so much benefit out of belonging to Tilt for the last year and a half. Highly recommended!”
“I have been a member of Title Boxing Littleton for almost one year now and it has been an awesome experience! If you are looking for a high-energy workout in a positive, supportive atmosphere, this is it. The trainers are super knowledgeable and encouraging, and the sense of community really stands out. I have also had the opportunity to take part in both private and small group training, which have been instrumental in my progress. I look forward to every session!”
5:30AM - 9PM
56 Winchester St # 10, Newton
Gyms
“I was first introduced to Future Shapes 11/2 years ago by the Physical Therapist I had after a knee replacement. She thought that I could benefit from continued strength training and highly recommended Future Shapes. I spoke with the owner Deedee, and she thought that one of her trainers, Toni, would be a good fit. From the day I met Toni, I was impressed with her knowledge of body mechanics, and anatomy and physiology. She quickly analyzed my needs and created a highly customized program. Whenever I complain of pain, tightness or weakness in my body, she is great at pinpointing the source of the problem and providing a solution. She works me hard and makes it fun at the same time! I have worked with several trainers in the past, none have come close to the skill and expertise of Toni. The gym has an upbeat vibe, up to date equipment, and is very clean.”
5:30AM - 7:30PM
166B Riverview Ave, Waltham
Gyms
“One of the friendliest CrossFit gyms I've had the pleasure to drop in to. I only did open gym but everyone I met was so lovely and very welcoming, great facilities, and lots of space! Gil was great and seems like an amazing coach!”
5:30AM - 8:30PM
65 Wiggins Ave, Bedford
Gyms
“I have been a member for so many years that I don’t even remember how long! I really appreciate have consistency and reliability at the front desk with Laura Keating. It is obvious she cares, does her job well and goes above and beyond!”
5:30AM - 6:30PM
15 Digital Wy Suite 15-22, Maynard
Gyms
“F45 is great! The classes are all scaled, so everyone can find the right level. You can already be full beast-mode or just starting out, and you will get a great workout lead by a fantastic coach! The free trial was great - I got to get a good feel for the classes before signing up. Happy to be a regular member!”
9:30AM - 4:30PM
1275 Washington St, Newton
Gyms
“We LOVE Kidcasso! Our daughter has the most wonderful time every time she attends a class, and comes home with so many spectacular creations! It's a love filled, creative environment run by the warmest team. Thank you for everything- especially for the kids camps during the strike, you made happy memories for these kids in a tough situation.”
“I am very satisfied with the iron gym, I discovered it a little over a year ago, and about 4 months ago I decided to sign up with the help of the wonderful personal Michelly Lira.
Helping with the training, and I confess that she is simply wonderful, so professional, so dedicated and careful in what she does... I really am extremely satisfied with her work, I recommend her to all my friends because I saw firsthand how professional she is !!! I've already managed to lose more than 10 kg and that's a victory for me.”
Open 24 hours
117 Great Rd, Stow
Gyms
“Have been a member here at the gym for 4 months now and love it. I have tried several gyms in the past, big and small, and can say Stow is my top choice. Great variety of equipment and space, one payment so all members have access to everything, and never too busy to feel rushed to share space. Have referred one person here and encourage lots of friends to try it out!”
6AM - 8PM
18 Adams St, Burlington
Gyms
“Highly recommend! Heidi & Brad have helped me make more progress in 3 weeks than I have in 3 years! They do a full evaluation and put you on a program specific to you and your goals, while pushing you out of your comfort zone & past what you think you are capable of! Excited for the next few months of training with the MW team!”
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“OTF Concord is amazing! I’ve only been going for a few months but this studio has completely transformed my approach to fitness/working out. Every single coach is outstanding — high energy, friendly, attentive, motivating, and supportive. I feel my strongest, both mentally and physically. Thank you to Krysta, Julianne, Mallory, both Taylors, and all the staff at OTF Concord for helping us all be healthier!”