(MCT) -- It's a Wednesday evening at the Pop Physique studio in downtown Baltimore, and a dozen women - most clad in leggings, T-shirts and socks - are rotating their hips while trying to hold an exercise ball between their thighs.
"Great job, guys!" says instructor Smithy Onattu, directing her students via a headset as a playlist with songs such as Lana Del Rey's "Florida Kilos" and "Tumblr Girls" by rapper G-Eazy pumps through the art-filled space.
Over the course of an hour, the group will tackle a series of exercises: planks and push-ups, plies and other ballet moves. They'll stretch while using bright orange straps and do demanding lower body work on yoga mats.
"Squeeze, squeeze. And pulse and pulse," says Onattu, as the women study her and watch themselves in a full-length mirror. "Squeeze from your seat as you lift up."
Pop Physique offers an hourlong, ballet barre-based class that draws on dance, Pilates and other disciplines.
The club is representative of a new workout space trend taking hold across the country: boutique gyms.
Boutique gyms offer fewer members and a more intimate setting than so-called big-box health clubs. They're typically run independently rather than being corporate-owned and provide specialized targeted exercise programs.
Think barre, Pilates, yoga, boot camps, cross training and group cycling. Personalized instruction is emphasized.
"The boutique fitness facility industry has emerged as a trend in the past five years," says Stephen Tharrett, a co-founder and principal of Club Intel, a Dallas-based brand strategy company that offers data and insight into the $22.4 billion dollar fitness club industry.
The growth in boutique fitness can be attributed to several key cultural, socio-demographic and economic trends, according to Tharrett.
"One is the rise of the niche fitness consumer who is seeking a personalized fitness experience that aligns with their unique interests and needs," he says, noting that millennials who tend to value innovation and entrepreneurship are helping to drive the momentum. "Another is the changing mind set of consumers that has moved from quantity is better to more personal is better."
The so-called big-box fitness segment has seen increasing pressure to cut prices because of the growth of budget clubs and slower membership growth because of the presence of boutique fitness centers, according to Tharrett.
Membership revenues for the big-box market players (several calls to large chain gyms in Baltimore seeking comment for this article were not returned) have remained relatively flat the past few years, while revenues from other sources (i.e., personal training, small group training, spa services) have shown steady growth.
That growing popularity of specialized offerings has led to boutique studios such as Pop Physique, the brainchild of Jennifer Williams, a former professional ballerina and Pilates instructor, and her husband, Deric, a brand developer. The couple launched their enterprise in Los Angeles in 2008.
Local devotees have been flocking to the Baltimore franchise since its opening in the summer of 2012.
There are about 2,000 students, according to a company spokeswoman. It's $20 for a single class, and new clients can get 30 days of unlimited classes for $100.
"It's something different," says Lauren Kohr, 25, of her decision to try a boutique fitness class.
A community relations staffer for a national charity, she has been coming to Pop Physique "off and on" for about six months. "It's challenging, but the atmosphere is not intimidating."
Amber Rose, Kohr's friend and co-worker, appreciates the relatively small class sizes. Most important, the 28-year-old volunteer manager believes her body looks and feels better. "And it really tones the booty," she says, laughing.
While Pop Physique has the look of a ballet studio, other boutique facilities evoke elements of a traditional gym.
Sanctuary Bodyworks opened nearly two years ago in what was formerly St. Stanislaus Church in Baltimore's historic district.
Today, it's a 5,000-square-foot homage to wellness, complete with stained-glass windows and a pew for seating alongside treadmills, massage tables and other equipment.
With architectural details that include soaring painted ceilings, hardwood floors and large windows that bring in abundant natural light, it's big enough to have a big-gym vibe, yet the atmosphere is softer, more inviting.
"My goal was that it be beautifully designed, with a serene feeling," says Brandon Hallock, who founded and owns Sanctuary Bodyworks. "We want clients to feel at peace when they come in and when they leave."
Hallock, a buff and youthful-looking 40, holds a bachelor's degree in exercise physiology and has 20 years of experience as a personal trainer and bodywork expert.
He rides his bike to work, and he believes in an integrated approach to fitness.
Thus, Sanctuary offers ample options: Pilates, deep-flow yoga, Zumba, acupuncture, belly dancing and Rolfing, a type of massage therapy. Soon, they plan to introduce aerial yoga with silks.
There's no membership here, though there are dozens of regulars who come weekly and biweekly. Personal training sessions begin at $70-$80; pricing for group classes varies but one can "drop in" for as little as $16.
"I never liked the idea of going into a room full of gym clothes-clad people - that scared me. But immediately I knew that Sanctuary was different," says Kelly Horvath, 45, a writer and editor who has been coming to the gym since the winter of 2013. "There's a very serene, tranquil environment here, which may seem incongruous with working out.
"It's not chock-full of people, and the instructors are very knowledgeable about anatomy, physiology and exercising safely so you don't get injured. That sealed it for me."
Hallock adds that he and his team "try not to overpack classes," and work closely with clients they train one-on-one to develop a holistic approach to their overall fitness goals.
"We're not trying to push any particular aesthetic or a Hollywood body on anyone," Hallock says. "I believe in sustainable fitness and training that's part of your lifestyle."
And it seems a growing number of people are in line in with Hallock's credo. More Americans are heading to health clubs than ever before, according to experts.
In the United States, more than 62.1 million Americans used a health club in 2013 (up 5 percent, from 50.2 million, in 2012), based on a study conducted by the International Health, Racquet & Sports-club Association (IHRSA), an industry trade group.
Among the many choices available these days are "full-service centers providing a resort-like experience, family-friendly centers, small studios with expert trainers, convenient 24-hour gyms, women-only clubs and sport-specific facilities," according to a statement from the IHRSA.
The results also showed that nearly 53 million Americans were card-carrying members of more than 32,000 health clubs nationwide. On average, members frequented a fitness center for 102.9 days in 2013, an all-time high.
Club Intel estimates that approximately 20 percent (or nearly 10 million members) of all fitness club members belong to a boutique facility.
One current indication of the industry's growth is the emergence of a new group, the Association of Fitness Studios, whose focus is to provide resources and support for the boutique fitness industry.
Andrea Worthington is a veteran trainer and lecturer at Towson University's department of kinesiology. She believes boutique gyms are a positive development but doesn't necessarily favor them over other facilities.
"Anything that helps people become more active has value, because obesity has become normal," says Worthington, who has lived through the era of spandex and Jane Fonda aerobics. "About 23 years ago, I was working at Brick Bodies. I've seen the whole health club evolution and know that health is certainly not a fad."
She notes that boutique gyms are just one of the emerging trends. Workplace fitness sites are gaining speed, too.
"As people look for ways to get people exercising and moving their bodies, you'll see new concepts. They're going to grow and grow."
A desire to create a highly personalized, affordable fitness model brought business partners Ben Supik and David Kinkeade together four years ago.
Today, the trainers co-own the Activate Body studio, a boutique gym nestled among greenery in an industrial chic building in Baltimore.
"Exercise is a science involving biology, chemistry and physics," says Supik, 32, who earned a degree in exercise science from Towson University, and has consulted for top universities and Fortune 500 companies.
Supik was a trainer at a major health club for several years, so he doesn't knock big health club chains. However, he wanted to create a different dynamic.
"It can be expensive having a monthly membership. And if you add personal training, which costs extra in most big gyms, many people can't afford it," he says.
At Activate Body, first-time members pay $89 for unlimited personal training and nutrition coaching sessions in a 30-day window.
After that, the most commonly used membership option at Activate Body is 12 personal training sessions and two nutrition coaching sessions for $299 per month for a year, Supik says.
To date, Activate has had about 100 students. On a recent visit, tiny group sessions were taking place, with men and women of different ages side by side doing squats and other exercises under the watchful eye of Kinkeade.
A former forensics interviewer turned fitness enthusiast, Kinkeade has shed 90 pounds over the past few years. "I believe in this, because I have lived it," says the 43-year-old husband and father.
Lyn Meyerhoff, 23, is a new client at Activate who says she never enjoyed the crowds at big-box gyms.
The organ transplant coordinator, who hails from a family that is well known in philanthropy circles, has the resources to work out anywhere.
But she hadn't found the right fit until a friend who is an Activate fitness coach suggested she come in.
The immediate personal attention Meyerhoff received has proved to be a motivator.
"I knew what to do, but wasn't having much luck losing weight on my own," says Meyerhoff. "I immediately loved it. Ben is very understanding and tuned in to what I need. I'm making friends. It feels good to work out."
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