Welcome to Modern Barre, a boutique fitness studio located in Chestnut Hill, MA offering barre classes for adults of all levels. The Modern Barre approach offers a balanced and effective workout that will strengthen, lengthen, and tone your entire body. Clients will benefit from small class sizes allowing for individualized attention and personalized instruction. Our mission is to create a challenging yet supportive environment to leave you feeling energized, refreshed, and inspired. We look forward to seeing you in the studio!

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Classic Foundation | Modern Technique

Modern Barre classes are full body, low impact workouts inspired by the foundations of ballet, Pilates, and yoga. Classes utilize the ballet barre, light resistance, and body weight exercises to increase total body strength with minimal stress on joints. Each strength exercise is followed by a targeted stretching segment to increase flexibility and lengthen muscles. No dance experience is required and clients of all ages and fitness levels will benefit from this safe, yet challenging workout. Each class is set to upbeat music and ends with a calming cool down to leave you feeling centered and refreshed.




  • Improve posture
  • Increase core stability
  • Improve flexibility
  • Increase strength
  • Burn calories
  • Boost metabolism
  • Enhance weight loss
  • Reduce stress

Past | Present

Barre fitness has been adapted over the years from a system created in the 1950s by professional ballet dancer, Lotte Berk. After sustaining a back injury, Berk began rehabilitating her body using a combination of orthopedic stretches and ballet barre exercises, resulting in a unique workout program which is now known as barre fitness. Modern Barre has combined these classic foundations with modern technique to deliver a simple yet effective program with a multitude of benefits.


Signature Modern Barre

Our signature class offers a low impact, total body workout utilizing the ballet barre, light resistance, and body weight exercises. Each exercise works muscles to fatigue and then stretches them to increase flexibility and create long, lean lines. Sessions end with our calming cool down for total mind-body integration. Clients of all levels are welcome and modifications will be offered.

Signature Express

Your favorite class condensed into an efficient 45 minutes to leave you feeling toned, energized, and ready for the day ahead. Your go-to when time is of the essence.

Cardio Barre Fusion

Everything you love about our Signature Modern Barre class, with the addition of an upbeat, aerobic workout. Cardio Barre Fusion is open to all fitness levels and is a perfect choice for those looking for a dynamic, cardio workout with all of the benefits of barre.

Beginner Barre & Stretch

An introduction to the Modern Barre technique focusing on alignment, core stability, and flexibility. Classes work at a slower pace with fewer strength repetitions and increased stretching segments. A perfect choice if you are new to barre, haven’t worked out in a while, or are looking for a break between higher intensity workouts.


We look forward to seeing you in the studio! Click to visit our online schedule and reserve your spot. If you have questions regarding potential times and classes please contact us at . We're happy to hear from you!


Price Price/Class
Single Class $22 $22
Five Pack $100 $20
Ten Pack $180 $18
Twenty pack $320 $16
Purchase Classes

Policies and Info

  • Online sign up is required to secure your spot for class.
  • Classes must be paid in full before attending.
  • Clients must be 16 years of age or older; clients under 18 years of age require parent/guardian permission.
  • Expecting moms, please bring a doctor’s release.
  • Class credits expire 6 months from date of purchase.
  • Please allow 12 hours for cancellations to avoid a full class charge.
  • All class purchases are non-refundable and non-transferable.
  • 10% Student discount applies to standard pricing and cannot be combined with specials or other promotional offers.
  • Equipment and mats are provided by the studio. Barre socks are available for purchase.
  • Sticky socks are recommended for all barre classes.
  • Please enter through the rear door behind the building.


Julia Williamson | Owner

With more than 25 years of dance and athletic training, Julia has taken inspiration from a variety of techniques to develop the Modern Barre approach. She is thrilled to have the opportunity to share her knowledge to help others find balance, confidence and fulfillment while reaching their health and fitness goals. Her mission is to create a supportive and energizing experience clients can look forward to every week.

Growing up in the Boston area, Julia began dancing at the age of 3. With a foundation in classical ballet, she pursued her love of dance and fitness as a member of the New England Patriots Cheerleading Squad, performing at games and appearances throughout the '08 and '09 seasons.

Julia graduated with a B.A. in Psychology from Hamilton College, where she was a member of the Dance Team, Varsity Lacrosse Team and Varsity Cross Country Team. She is a Certified Personal Trainer through the National Academy of Sports Medicine (NASM) and a Certified Group Fitness Instructor through the American Aerobics & Fitness Association (AFAA).

Quinn Sonia-Sergi | Instructor

Quinn is a classically trained ballet dancer and instructor who began practicing yoga to alleviate lower back pain and to quiet mental chatter. What she found, in addition to these benefits, was a deeper, more compassionate connection to her physical body.

Inspired by this radical shift in consciousness and by her skilled and caring teachers, she sought to carry on the thread of compassion by becoming a yoga instructor herself.

Quinn is a graduate of Daniel Orlansky's Yoga of Energy Flow 200-hour Training Program. Her teaching style blends the quiet strength of ballet with the meditative flow of a traditional Vinyasa practice.


242 Commonwealth Avenue
Chestnut Hill, MA 02467


Free on-street parking is available on Commonwealth Ave and on the Commonwealth Ave Carriageway (please be careful crossing!)

1/2 mile from the Green line

Two blocks west of Boston College