Fitness That Feels Like a Throwback

Start today & get your first 2 weeks for JUST $39

Try any class, any time for 2 weeks- Mat Pilates, Spin (w/ headphones!), Strength + Yoga. Feel the community. Catch the beat. Then decide if it's your jam.

Sweat. Smile. Repeat.

The Underground isn't just another gym. It's your throwback to movement that feels good, in a space that feels like you. Our 90s-inspired studio is full of energy, color, and community — where every playlist bumps, every instructor knows your name, and every workout ends with high-fives (and maybe a throwback track or two).

With heated mat Pilates, silent disco spin, total-body strength, and yoga — you get a full menu of sweat without the burnout. No pressure. No ego. Just good movement and great people.

Whether you're a mom squeezing in a post-drop-off reset, a young pro turning "fitness curious" into full-on committed, or someone finally carving out a consistent routine—this is where it clicks.

Welcome to Your New Favorite Studio

LET'S GO!

The place where fitness stops feeling like a chore - and starts feeling like a lifestyle. 2 weeks. $39. What are you waiting for?

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5090 N 40th Street, Suite 120, Phoenix AZ 85018

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WHAT OUR MEMBERS SAY ABOUT US

Jack Short

"Absolute powerhouse spin studio with excellent instructors, different themes/styles of music, and a banging facility themed up retro 90s style. The workout quality is great, but the community feeling and welcome of the Underground is what has kept many of us around for years. Go and enjoy transformative exercise experience!"

Olivia Frazier

"Tried the heated mat Pilates class at Underground Phx and it was such a great change of pace from my usual workouts. The heat made it challenging in the best way, and the flow kept me engaged the whole time. Zoey’s instruction was clear, encouraging, and she had such a great energy that made the class fly by. 10/10 playlist also. Left feeling stronger, more stretched out, and totally re-energized. Highly recommend."

MEGHAN CUMA

"This place is amazing!! I’ve been going for a couple months now and absolutely love it. The hot mat Pilates is a great workout in small class sizes. I tried cycling here for the first time and I’m getting addicted!! Intense class with great music and kind helpful instructors. Everyone I met here is so nice, I’m thankful to have found this place!"

The Underground Athletics

It feels good to belong somewhere again.

You know that feeling when you walk into a space and it just feels right? That's what we hear every day.

The Underground feels like a second home. Our community is warm, our instructors are real, and the experience is unforgettable.

Silent Disco Spin: You control the volume. We bring the heat.

Heated Mat Pilates: 85-92 degrees of full-body strength + length.

FLEX Strength Training: Total body. High reps. No boring sets.

Yoga Flows: Heated, guided, grounding.

All under one roof. All included.

But you're not just showing up for a workout. You're showing up for YOU. The instructors remember your name. Members stick around after class. Strangers become your "see you next class" crew.

This isn’t about competition or chasing perfection. It’s about connection, consistency, and actually looking forward to your workouts again. Claim your 2 week trial now (spots are limited!).