SLS Fitness
SLS Fitness is a boxing gym located in Lowell, Massachusetts. Specializing in Fitness Boxing. Rated 4.8 out of 5 by community members.
Specialties
Reviews
⭐️⭐️⭐️⭐️⭐️ SLS Fitness in Lowell isn’t just a gym—it’s a sanctuary, a community, and a place where transformation feels possible again. I first started going when it opened, but had to step away when my mother got sick. I started back up in April, and I have felt absolutely incredible ever since. As someone who is a part-time fitness trainer, I know what good coaching looks like—and I choose SLS because it gives me the tools, structure, and motivation I need to succeed in my *own* fitness journey. I love being in classes where I can turn off the thinking, trust the experts, and simply execute. The energy, focus, and support here are unmatched. After years of struggling with weight loss through menopause, nothing seemed to work. Diets, strength programs, bodybuilding routines—everything felt like pushing uphill. But walking back into SLS reminded me what a true fitness home feels like. From the moment you enter, you’re greeted by people who actually know what they’re doing—experienced professionals who care, who guide you, who want you to succeed. This is not a chain gym where you’re welcomed by someone just punching a clock. Here, you’re met with genuine humans who are invested in you. Sherri, the owner, is a legend in the Merrimack Valley. She pushes you to your max while leading with knowledge, heart, and authenticity. Her passion is unmatched. Stephen is pure fire—loud in the best possible way, hilarious, motivating, and the kind of coach who can pull strength out of you that you didn’t know existed. He makes every class feel electric. Nick is equally incredible—always engaging, genuinely interested in how you’re doing, asking about your weekend, cheering you on, and celebrating every little win. His encouragement makes you feel capable, confident, and ready to crush every workout. The balance of personalities, styles, and expertise among the coaches is what makes SLS extraordinary. The amenities are next level: • An amazing shake and snack bar with clean, healthy options • A private, individual sauna • A reformer Pilates studio • Kickboxing • Strength training • A full spin studio • Aerial yoga • Stretch classes • And so many ways to train that you’ll never get bored Since coming back, I’ve lost 10 pounds of fat, built muscle, gained real strength, and achieved things I didn’t think were possible for me anymore. I feel confident, healthier, and genuinely happy. SLS Fitness is not just a place to work out—it is a place to thrive, to grow, to feel supported, and to rediscover your power. I love Steve, Nick, and Sherri, and I will never imagine my life without this incredible gym. If you want results, expertise, motivation, and a community that truly lifts you up, SLS Fitness is the place.
This wellness and fitness center will transform your life! Hands down, it is a phenomenal place to workout, recover, and grow alongside other community members. The coaches are significantly knowledgeable and are invested in your wellness journey. The classes are engaging and fun, and personal training sessions are beyond amazing. I do personal training with Frank who is FANTASTIC and I highly recommend him. Shout out to Colleen as well---I love her boxing classes which have also been a highlight of my SLS experience.
I’ve been a member of the SLS community for many years now! This place is so much more than a gym. The trainers all take the time to personally get to know their members and you will quickly become friends with the other members you take classes with! The trainers are so knowledgeable and cater each workout to your individual needs. I cannot recommend this gym enough!
I was a complete gym phobic before joining SLS FITNESS. From day one, welcomed and shown around I felt the sense of community that’s a driving value here. I was a complete beginner, and was made immediately comfortable with the intake process, and in subsequent classes. The coach led, organized classes are the perfect format for me and I’m constantly learning and progressing under the remarkable coaching staff. It’s clear that these folks are not just fitness professionals, but they are also fiercely dedicated to their craft. SLS isn’t just a gym, it’s a community. It’s a community dedicated to teaching, learning, acceptance, and charity, and I could not recommend it any higher!
Nothing but great things to say about SLS Fitness. The culture of this place is what keeps me coming back. I work in sales where my hours are very long and unpredictable and it's often hard for me to go there consistently. Every time my wife goes in without me, she always comes home telling me that the staff was asking about me. It's this kind of personalized attention that you don't get at the big gym franchises. It's not overly crowed and I really enjoy groupy atmosphere. You can tell everyone is there for the same reason and you have unlimited support if you need it. If your looking to take your workouts to the next level, I HIGHLY recommend looking into PT (personal training) with any of their coaches. I've personally seen huge progress since I started it 2 years ago