About SLS

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Sherri Laffey Sarrouf, the owner of Elite Fitness Professionals, Inc. DBA SLS Fitness, had a lifelong dream of offering the Merrimack Valley fitness community holistic fitness coaching in a “whole-body wellness” approach. In 2010, she opened SLS Fitness Strength and Conditioning Center in Lowell, MA and since that time the Center has expanded from 7,500 to 18,000 square feet. SLS Fitness also manages corporate fitness centers within Network Drive in Burlington, MA and at MACOM in Lowell, MA. At SLS Fitness, Ms. Sarrouf’s passion for developing unique experience fitness programming offers people of all ages and fitness levels many kinds of classes, including Group Fitness, Boxing, MMA, Yoga, Meditation, Metabolic Strength and Conditioning, Team Athletic Based Training, Parkinson’s Rock Steady and more. In addition, there are Physical Therapy Specialists, Chiropractic services and café services, specializing in plant based foods, organic protein shakes and supplements. Ms. Sarrouf pioneered the concept of ‘class based’ functional movement. When SLS opened, the concept of having a coach in a group setting was totally new to the fitness industry and it has spread like wildfire. The establishment of an intensive ‘30 minute’ workout coupled with the tenacity to hire the best certified and educated coaches has made SLS one of the top strength and conditioning facilities in New England.

In 2009, Ms. Sarrouf traveled to Wake Forest University to train with Metabolic Effect owner, Jade Teta. She then launched the first Metabolic Effect group classes in New England. Metabolic classes exploded at SLS and the demand for the class, by members, is continually increasing almost nine years later.

Ms. Sarrouf and the SLS staff was chosen to partner with Lowell General Hospital to be their public educator offering seminars on the importance of fitness.

Prior to founding SLS Fitness Ms. Sarrouf’s experience in the strength and conditioning industry spanned 27 years throughout Massachusetts and New Hampshire. Officially incorporated 12 years ago, under the corporate banner of Elite Fitness Professionals, Inc., Ms. Sarrouf provided group fitness management for Gold’s Gyms in Nashua, NH, Merrimack, NH, Manchester, NH and Tewksbury, MA.

Sherri Laffey Sarrouf is also the founder of the Fitness For a Cure fundraiser to benefit ALSAC/St. Jude Children’s Research Hospital in Memphis TN. Fitness For a Cure has raised $4.6 million for St. Jude Children’s Research Hospital since its inception. What began as a $5,000 event in 1999 has grown to a $607,000 annual event supported by a committee of 100+ volunteers and the Merrimack Valley/Lowell community. She has traveled throughout New England speaking to numerous groups, businesses and schools on behalf of St. Jude.


Sherri was a 2016 finalist nominee for the prestigious Enterprise Bank Philanthropic Award and in 2019 received the Boston Celtics “Heroes Among Us” award for her work and dedication to St. Jude.


Personal training at SLS Fitness is awesome! If you are trying to put the pieces back together (post-surgery) or just trying to reboot your work-out, one on one sessions will definitely help you achieve your best result. I have been working with Susan Kirby for two years. She is encouraging, precise and patient! She is able to not only improve your strength & conditioning, but she is very helpful with mindfulness exercises and suggestions on healthy food choices. Her degrees as a reiki master is an added bonus!! Treat Yourself!!
- Kim Pickul


We’re really excited for you to join us at SLS!