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Sixth Street Underground

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Boone, IA
Sixth Street Underground

Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Sixth Street Underground, Gym/Physical Fitness Center, 812 6th Street, Boone, IA.

Group Fitness Facility designed to serve those who are looking to lose weight, build strength, improve athletic performance, increase longevity, and simply feel better - we have a training program that works for everyone.

10/30/2026

We take training seriously... mostly. 🦖🐔 Happy Halloween from 6SU!

10/30/2026

Proof that hard work doesn't have to feel serious. 🎃

Our members showed up in costume and still got it done: squats in costumes, rows in skeleton tees, one very committed dead bug, and one member who decided the turf was the perfect spot for a nap when it felt too early to train.

We train hard, we laugh a lot, and we wouldn't have it any other way. 🖤♥️

Scroll through, tag yourself or a friend, and drop a comment shouting out your favorite costumes!

10/26/2026

Training with us really isn't scary! 👻Strong bodies, good people, and a gym where you'll actually feel at home. Your first class is on us. Send us a message or stop by 812 6th St in Boone.

10/23/2026

Who you spend your time with makes a world of difference.

Who are some of your favorite training partners (now or then)? Why?

Shout them out and make plans to train with them again sometime soon. Going solo works in a pinch, but we’re always better together ❤️

10/14/2026

Here's what nobody explains about
“trusting the process…”

…the process includes doubt.

…the process includes plateaus.

…the process includes days where you feel like you're going backward.

Those aren't signs the process - or you - are broken. They're part of the process. Trusting it means trusting the most uncomfortable parts, too.

Play the long game. ♥️

10/08/2026

Those who stay consistent with training, don’t have more motivation, willpower, or time, and aren’t focused on aesthetics - they’re seeking clarity.

Training isn’t pressure, it’s relief. It’s one of the few places no one needs anything from them. Movement steadies their mind, gives them peace, and helps them come back both physically and mentally stronger.

When movement becomes care instead of correction, when your body is treated kindly, everything changes.

If you’ve always thought exercise was a punishment for how your body looks try training for how it makes your body and mind feel - it’s a game changer.

We can help. ♥️

10/04/2026

Need a little more fun in your life? 😎

Need a little more energy these days? ⚡️

Need a real plan instead of just hit or miss workouts that once worked for you but aren’t now? 💪

Conditions don’t have to be perfect - take the first step.

New program block starts tomorrow. Just show up and we will provide the rest ♥️

09/25/2026

"If you want the rainbow, you gotta put up with the rain." — Dolly knew. ♥️

You don't need perfect conditions.

You need the ability to find steadiness and take care of yourself while life is still happening.

That's what we train for. 👊

09/18/2026

Motherhood requires strength. ♥️

You want them to see the best version of you?

The one that has energy for days?
The one that can best regulate stress?
The one that feels confident and capable?

Supporting your kids isn’t just about attending every one of their events and coordinating their practices, meals, etc.

Let them see you make time for taking care of yourself. Invite them in - show them that making time for your health is proving how much you value and respect both them and you. 🙌

Address

812 6th Street
Boone, IA
50036

Website

facebook.com

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