What happens when you mix pulse-pounding workouts, Biggie on the speakers, museum-worthy street art and a community that feels like family? You get The Underground Phoenix—a first-of-its-kind boutique fitness studio bringing unmatched energy, ’90s nostalgia and straight-up magic to the heart of Arcadia. Doors are officially open.

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More than a gym — it’s a full-sensory experience

Think: custom neon lights glowing over graffiti murals of Madonna, Biggie and Michael — each one commissioned by local artist Uvonte Reed (@uvontereed)—creating a space that feels more like a modern museum than a traditional gym. A full wall of over a thousand CD cases, all donated by loyal riders, adds to the nostalgic vibe — each cover a time capsule of the music that shaped a generation. Paired with high-intensity training, music-driven workouts, and a bold, immersive atmosphere, The Underground is more than a gym, it’s a passion project fueled by heart, hustle and the Phoenix community.

“The Underground isn’t just a place to sweat, it’s a full-sensory experience,” says Stephanie Schwartz, founder of The Underground Phoenix. “From the second you step inside, you’re hit with a current of raw, contagious energy that fuels movement and motivation.” 

At the helm is fitness powerhouse Stephanie Schwartz

At the helm is Stephanie Schwartz, a seasoned fitness powerhouse with more than 17 years of teaching experience and a reputation for delivering unforgettable workouts. Known across the Valley for her dynamic presence and top-tier instruction, Schwartz has led classes in some of Arizona’s most respected studios and health clubs. Unsurprisingly, at The Underground, you can expect nothing less than the best of the best — expert programming, fierce energy and a community that shows up hard every time.

Signature classes, grand opening deals and serious sweat

And then there’s the workouts. High-intensity, music-driven, sweat-drenched sessions designed to push limits, boost confidence, and make you actually look forward to your next class. The studio offers a variety of classes suitable for all fitness levels, including cycling, Mat Pilates, yoga, HIIT workouts and the signature FLEX total body conditioning class. To celebrate the grand opening, The Underground Phoenix is offering special promotions:

• Two weeks unlimited for $29.
• New clients who sign up for the monthly unlimited membership receive a custom curated swag bag with fun merchandise and secure the first month for just $99 ($169/month thereafter with a 3-month commitment).
• Grand Opening 10-class package for $129 (12-month expiration).
• Grand Opening 25-class package for $299 (12-month expiration).

More than workouts — it’s about movement, connection and community

In addition to diverse class offerings, The Underground Phoenix will host seasonal outdoor workouts and organize community events throughout the Valley. Whether you’re a hardcore fitness junkie or just looking to shake up your routine, The Underground is the go to studio to train hard, vibe harder and connect with a crew that lifts you up (literally and figuratively). 

To stay updated on the grand opening and future events, follow @theundergroundphx on Instagram, theundergroundphx.com or visit The Underground Phoenix at 5090 N. 40th Street, Suite #120, in Phoenix.