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4.9 / 5.0
Strength Training & Functional Fitness Underground Athlete
3150 Spring St, Fairfax, VA 22031, USA
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Editorial Summary

Why They Stand Out

"Underground Athlete in Fairfax, VA, offers specialized personal training in a private, focused environment. Observed strengths include experienced coaches with athletic development backgrounds, equipment ranging from free weights to sport-specific tools, and a curriculum emphasizing strength, speed, and conditioning. The facility maintains a low client-to-trainer ratio for individualized attention. Integration of performance testing and customized programming for athletes and fitness enthusiasts."

— PTC Review Team

Facility Hours

  • Monday: 5:15 AM – 9:00 PM
  • Tuesday: 6:00 AM – 9:00 PM
  • Wednesday: 5:15 AM – 9:00 PM
  • Thursday: 6:00 AM – 9:00 PM
  • Friday: 5:15 AM – 9:00 PM
  • Saturday: 7:00 AM – 1:00 PM
  • Sunday: Closed

Community Feedback

"First off this place is AMAZING! I’ve been going here for a year, about 2-3 times every week, and it was the best decision. The company, the coaches, the workout plans, the space. If you want to get healthy and don’t know where to start or even if you are a regular gym goer this place is for you. I’d whole heartedly recommend anyone here, that’s how great this place is. The coaches do such an amazing job working with you right off the bat, no matter your fitness level. They provide targeted workouts to help meet your goals and adjust for any previous injuries(and I had a few!). The group classes are also killer and the company truly feels like working out with friends and that makes the experience that much better. Don’t get me wrong, if you don’t put in the effort yourself to be present and push yourself, you may not see the results you’re aiming for, but it feels easy to do with these guys helping! I feel so much healthier, stronger, and more confident because of all of the help they’ve provided me this past year. Shout out to the coaches (Quinn, Clay, Justin, Humberto!) thank you guys for being so great! :)"

Shabnam Said

June 2025

"I've been a member of Underground Athlete since 2016. I have no idea what the typical membership tenure is for a gym, but I bet it's a lot lower than 5+ years. What keeps me coming back? Lots of things, but primarily, the coaches. Every coach I've worked with is dedicated, knowledgeable, encouraging, and eager to help you define and meet your personal goals. To be a coach at UA means you are devoted to the complete well-being of others. I also enjoy the people I work out with. Members are older and younger, in-shape and working-on-it, a diverse group cultural backgrounds and abilities -- all cheering each other on. I encourage anyone who is serious about improving their health to consider UA, whether you want to build muscle, increase mobility, lose weight, improve your mental health, or simply feel better in general."

Rebecca Chanin

June 2024

"It’s been a while since I did a UA review, so I thought it was time for an update. If you read the reviews you already know that UA is an amazing place.. I wanted to touch on something else this time. I have spent the last week building a cinder block retaining wall. That’s important because at the end of I felt fine! We talk about weight, muscle mass, prs, etc. What maybe we don’t talk about enough is the ability to do anything physical you want to, understanding when to push and when to dial back. UA gives you that. I’m 64 and that is key for me. If that’s important to you, then you should definitely check out UA Still, the most important part of UA is the people. The trainers Justin hires and the people who train here, many of whom I consider close friends. Training with people who cheer you on, keep you accountable, miss you when you’re not there and generally enhance your life, that is what keeps you at a gym for ten plus years."

Sioux Lasley

July 2025

Frequently Asked Questions

What types of athletic performance testing does Underground Athlete offer in their personal training sessions?

Underground Athlete provides comprehensive performance testing including vertical jump, sprint times, and strength assessments to tailor programs for individual athletic goals.

Does Underground Athlete provide nutritional counseling as part of their personal training programs?

Yes, Underground Athlete includes nutritional guidance and meal planning within their personal training packages to support performance and recovery.

Is Underground Athlete's personal training suitable for beginners who have never lifted weights before?

Underground Athlete accommodates beginners by offering foundational coaching on proper form and gradual progression, though their focus is on athletic development.

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