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5 - 11AM 3:30 - 7:30PM
73 Princeton St #9, North Chelmsford
Gyms
Open 24 hours
28B Nashua Rd, North Billerica
Gyms
“Highly recommended gym/facility with excellent open space, uplifting atmosphere, friendly, knowledgeable and professional trainers! Definitely not your typical gym..and just better all around. Boston Barbell is welcoming, meets all my expectations for fitness. I couldn’t be happier with the progress made so far. Training is very personalized and on point..had opportunities to train with both Chris and John. Both excellent in their position in helping to meet my health and fitness goals..getting me stronger and toner with each session. So much is available, looking forward to starting small group sessions soon. Best place to be a part of especially if health and fitness matters.”
5AM - 8PM
106 Perimeter Rd, Nashua
Gyms
“I can’t say enough great things about CrossFit Nashua. It has truly changed my life.
The coaches are incredible, they take the time to make sure you’re using proper form during every exercise, which not only helps you improve but also keeps you safe and injury-free. You can tell they genuinely care about every person who walks through the door. Spending just one hour here each day, surrounded by such a supportive and motivating group of people, has completely transformed how I feel. After every workout, the rest of my day just flows, I have more energy, a better mindset, and an overall sense of well-being that I didn’t have before.
At this point, I honestly can’t stop going, and I don’t want to.
If you want to feel good every morning, start your day strong, and be part of something truly life-changing, this is the place to be.”
“Absolutely phenomenal gym. Filled with plenty of free weights, an abundance of machines, and incredible loving staff. Probably the best gym I have been to in a long time.”
5:15AM - 8PM
345 Chelmsford St, Lowell
Gyms
“One of the best gyms anywhere. All the instructors are very nice....my youngest is on the spectrum and they work with him during classes. They really do care to make sure everyone feels comfortable in class.”
Open 24 hours
139 Littleton Rd, Westford
Gyms
“Great, fully stocked, clean gym with friendly staff. I bought a week pass for my stay in Westford and felt very welcome. I loved that it was open during off hours, which made it really easy to slip into my routine while in town.”
5:30AM - 8PM
930 Main St, Acton
Gyms
“This is a top tier facility with great coaching and equipment. Tons of options for group classes and 1 on 1 sessions.
Very knowledgeable coaching. For example they are focusing on good running technique in class as the weather warms up and we start running more. Highly recommend for any range of athleticism and experience.”
“Bedford NH is my home gym, but the last few months I’ve been going to OTF South Nashua primarily on Tuesday at Noon. Coach Liz is awesome and if you want to ensure your core is on 🔥, just take one of her classes!”
“Clocked in for a pull day. Signed up the day before. Equipment was awesome and the environment definitely speaks volume in terms of locking in on your workout, especially for early birds like me! Totally recommend.”
“I'm 66 years Old. 🎊 I feel so independent . I'm kicking my legs for first time in years. The lap pool of course 💜💜💜 .I Love You Work Out Club Love Rebecca Nastasi”
“I was in Nashua, NH for a week helping my son move into a local apartment and the gym in his building was sub-par for someone who likes to seriously train multiple times per week and couldn't think of a better way to start the day. After a quick google search I found American Fitness Center and decided that would be my first local gym to try and decided to do a drop in. Jason greeted me with such kindness and gave me an excellent deal on a week pass just for my time staying in Nashua. The gym is HUGE, has every bit of equipment that someone who trains regularly would ever need (DB's, KB's, Machines, Functional training, Turf with sleds, cardio eq - the list goes on- all in excellent condition). During my 4 days working out, the gym was virtually empty (or feels that way due to the size), the gym was clean and I was always greeted with a smile and great vibes! Can't wait to visit again and get my next week pass!”
“I had the opportunity to try all of the gyms in the area before choosing Best. The size of the facility, the friendliness and commitment to the members of the staff and the programs have no equal. It’s large and spacious with plenty of the equipment. I’ve had an opportunity to work with one of the trainers Sean F. He is exceptional and even has a relatively good sense of humour.”
Open 24 hours
7 Summer St #5, Chelmsford
Gyms
“Great place been going for about 2 months going three times a week and already feel more fit. Trainers are positive and it’s easy to get a great workout in in just 30 minutes.”
“This gym is the absolute best! Their yoga classes and teachers are top notch. Every teacher and class has a different vibe, and all are excellent. Their fitness areas are clean, contains well cared for equipment, never overly crowded, and has everything available for a great workout. The staff is also amazing. Their pricing is very reasonable with options for different types of membership. I've belonged to many gyms in my life, and this one is by far my best experience.”
“I’ve been exercising at Title Littleton for 7 months and it’s been a fantastic experience. Most of the classes are boxing-focused with a couple of kickboxing sessions each week. Every class is instructor-led, starting with a quick warmup, followed by boxing, and finishing with a solid core workout. The coaches walk around to correct form, give encouragement, which makes a big difference.
I especially enjoy classes with Masha, Paola, and Shalton — they’re passionate, motivating, and push you to give your best. I’ve also been taking private “Mobility” sessions with Joleen, and she’s amazing. It’s an hour of stretching and floor exercises that has really improved my strength and flexibility.
I’ve gotten stronger, lost weight, and genuinely look forward to workouts here. If you don’t like the typical boring gym routine and want something effective, fun, and supportive, I definitely recommend Title Littleton.”
Open 24 hours
77 Derry Rd, Hudson
Gyms
“Excellent! Everyone stays to themselves. Very polite staff and guests. There is more cleaning here than I've ever seen. The full time staff lives and breathes the lifestyle.
A+”
4:30AM - 7PM
1934 Lakeview Ave bldg 7, Dracut
Gyms
“Love this gym ? it's small but everyone is friendly and I look forward to my gym sessions. There's a decent variety of equipment and it never feels like people are fighting over stuff or waiting a long time for something.”
“i’ve been going to the chelmsford location for years and recently switched over to the lowell location probably the best decision i’ve made, everyone here is super friendly from the staff to the other guests 10/10”
Open 24 hours
16 Manor Pkwy, Salem
Gyms
“24hrs / overnight access includes usage of almost the entire sport complex [except the swimming pool].The primary Men's locker room includes an "almost hidden" discreet side door steam room off the communal shower; next to where a 6 man whirlpool sits dormant, needing repair / literally hidden behind a makeshift, prefabricated temporary wall. Multiple long term members have shared with me how beloved this whirlpool once was and that they dream of one day it being repaired and the wall finally taken down ⬇️. In my experience, when a men's locker room does have the divine ultimate troika of steam room, sauna, AND whirlpool, the space is elevated to some where truly rare, sublime, magical and these spaces are noted to be the most consistently busy (by daily usage) mens locker rooms (non-military / non-university) in the lower 48 states; Dowd YMCA, Charlotte, William White YMCA, Winston-Salem, Sports Mall, SLC, Lloyd Athletic Club, Portland OR, Prime Time Fitness, Burlingame, CA etc.If the new owners / management wants to continue elevating Salem Athletic Club to a world class level and to earn true loyalty from long time members, they will take down the ghastly temporary wall and reinstate this amazing whirlpool. ??”
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.”
4:30AM - 1:30PM 3:45 - 8:15PM
160 Littleton Rd, Westford
Gyms
“Couldn’t recommend this place more! I joined knowing that I needed a consistent routine that I couldn’t keep on my own, and I am so glad that I did. It is such a great community in Westford with fantastic staff. You are always greeted with a smile here. I have gained so much confidence and strength these past several months and always leave with a great boost of energy for the day! Thank you OTF Westford!”
“Super clean facility, friendly and attentive staff and all the equipment you need to have a successful workout. The trainers are kind and hold you accountable. The manager keeps that place in check.I had a great time visiting from New York.”
Open 24 hours
142 Lowell Rd, Hudson
Gyms
“The manager Logan was very friendly, and greets me any time i walk in the door, he is also very knowledgeable in anything fitness. The place was very clean. Ive checked out a few gyms in the area, and the vibe here was perfect. Lots of different machines. I had a few questions, and concerns, which the staff have been so helpful with! Im a beginner, and found this place literally perfect for someone, who has no idea how to work out.”
Open 24 hours
150 Coliseum Ave, Nashua
Gyms
“Great place to get into shape in Nashua, New Hampshire. Brandon who works behind the counter usually drops everything to help others in the gym. I had a issue with trying to join online, Brandon told me to come in and he said he would help. I did get to join and I'm referring other friends like Robbie to join. Maybe Brandon should be a supervisor and share his expertise with others etc.”
“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!!”
5:30AM - 7:30PM
1100 Gorham St, Lowell
Gyms
“I joined CrossFit Merrimack in January 2013 as a New Year's resolution, and over a decade later, I'm still a member. Bob has built an incredible environment that is welcoming, supportive, and motivating for all fitness levels. The coaching is excellent, the programming is challenging and the community is second to none. What started as a resolution became a lasting part of my life, and I highly recommend CrossFit Merrimack to anyone looking for a great gym and a great community.”
Open 24 hours
315 Middlesex Rd Units 6 & 7, Tyngsborough
Gyms
“This is a great gym. Easy location right off the highway. Equipment is new and kept up to date. Wide array of weights dumbells, kettlebells, machines. People who work there are so nice - and same goes for people who work out there. Check it out !”
“Dawn, the owner and main instructor, is absolutely wonderful. Her choreo is perfectly challenging while also being accessible for all fitness levels. She’s created a welcoming environment and always goes above and beyond for members. If you’ve been looking for a fun way to start or continue moving your body (and get a great workout), I cannot recommend Zumba at zClub enough. The community is welcoming and so much fun to be a part of!”
“I’ve only been here 2 days and I can already say that this will probably be the best investment I’ve made in my health in a long time and that I feel being here will finally bring me success in my health and fitness goals.Just being able to focus on myself and not being in a huge crowded facility where my anxiety and intimidation prevented me from doing just that.This facility is small and private, it has every thing you need to hit every body part and the atmosphere to do it.Thank for letting me join and having this place around.”
6AM - 8:30PM
83 Parkhurst Rd, Chelmsford
Gyms
“Dating back to when I think I started at Jazz (2017), THE BEST DECISION I’VE EVER MADE! From the instructors, the classes, the music, the positive energy & dancing next to all of you on the dance floor, AMAZING! Try it, you’ll LOVE it!”
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“This is a 100% positive review of Skill of Strength (SOS). I’m a masters athlete at the local, regional, national, and world level. My needs and expectations are not typical - I don’t go to the gym because I want to lose a few pounds, I go because it helps me compete. I have specific goals and SOS provides the kind of expert performance coaching that I need in order to thrive. Mike Perry and his team understand my goals and mentality and as a result I’m incredibly well prepared. I remain injury free with little or no pain, my physical capacity seems to keep increasing, and I can perform at a level that most people… can't. I’ve been an SOS member for years and I joined after a thorough search of the Boston area for a high performance, technically oriented gym staffed by expert coaches who are on the cutting edge of their field. If you have specific competitive goals and want coaches who work with high performance amateur and professional athletes, all packaged in a gym where standing on the gas is encouraged, you’ll be right at home at SOS.”