Black Box 100

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Black Box 100 A group fitness gym w/ classes prioritizing your mental health and recovery to bring healthy changes! Black Box 100 puts an emphasis on mobility, and recovery!

Owner Erin Monfre is a certified personal and group fitness trainer who also specializes in training athletes ages 10+. Erin focuses on teaching you the fundamentals of fitness and form all while creating a space where you can mentally unplug. Black Box 100 aims to create an environment you can feel safe in and create momentum to make fitness a consistent part of your routine. At Black Box 100 there are no mirrors, and no tracking of weights or times to complete workouts. The "100" is an attempt to 100% disconnect from life outside those doors in order to pour into yourself for 1 hour. We all need that time and disconnect in order to fully show up for ourselves, families, co workers and the day to day tasks we face! We offer access to a 2 person Good Health Saunas infrared sauna, as well as a Chilly Goat cold plunge. As we age, our bodies need low impact ways to hit a high heart rate zone, and recovery to keep us feeling young. All fitness levels and walks of life are welcome, as Black Box 100 is an all inclusive environment. We look forward to meeting you!

11/02/2026

You've built your client base. You're ready to train independently. But have you figured out where you'll train your clients?

Opening your own facility comes with a lot more than finding a space. Equipment, overhead, access, and the responsibility of running an entire gym can become major hurdles before you've even had the chance to grow your business.

There's another option.

At Black Box 100, independent trainers can rent professional training space without taking on the cost and responsibility of operating their own facility.

And we're inviting local trainers to come see what that looks like at our upcoming Trainer Social!

You'll get to:
Tour the facility and explore the equipment.
Learn how our independent trainer rental works.
Ask questions about access, insurance and rental terms.
Meet other local trainers over mocktails and small bites.
No commitment. No pressure. Just an opportunity to explore a space where you can focus on what you do best: coaching your clients.

📅 Friday, November 20
⏰ Two time slots: 7–11 AM or 4–6 PM

Ready to explore your next step as an independent trainer?

DM us to find out more and reserve your spot.

You became a personal trainer to build stronger people. Not to spend your entire career building someone else’s business...
10/28/2026

You became a personal trainer to build stronger people. Not to spend your entire career building someone else’s business.

But going independent? That can feel like a massive leap.
Signing a commercial lease. Buying equipment. Managing a facility. Taking on expenses before you’ve even trained your first client.

What if you could skip all of that and focus on building YOUR business?
At Black Box 100 in Sussex, WI, we’re opening our doors to qualified independent personal trainers who are ready to take that next step.

Here’s what that could look like:
✓ Keep 100% of your client-service revenue
✓ Set your own rates and schedule
✓ Train your own clients under your own brand
✓ Access professional equipment and our InBody scanner
✓ Offer 1:1, partner, or small-group training (up to 4 people)

Your clients. Your business. Your rules.
Without having to open an entire gym.

Interested in seeing how it works?

🔗 Check the link in our bio to learn more, or comment TRAINER below and we’ll help you get started.
Know a personal trainer in the Sussex or greater Milwaukee area who’s ready to go independent?
Share this post with them. It might be exactly the opportunity they’ve been looking for.

We’re just 12 days out from our October FREE community event at Black Box 100 “Move + Glow”! DM us “MOVE” and I’ll send ...
10/19/2026

We’re just 12 days out from our October FREE community event at Black Box 100 “Move + Glow”! DM us “MOVE” and I’ll send you the sign up link!
Come with a friend. Must sign up to participate 💪🏼 ✨

We’re just 12 days out from our October FREE community event at Black Box 100 “Move + Glow”! DM us “MOVE” and I’ll send...
10/19/2026

We’re just 12 days out from our October FREE community event at Black Box 100 “Move + Glow”! DM us “MOVE” and I’ll send you the sign up link!

Come with a friend. Must sign up to participate 💪🏼 ✨

09/16/2026

Your first week at Black Box 100 in Sussex is FREE. Seven days of trial. No card required.

Give our members a microphone after class and suddenly everyone has an opinion. 😂

The exercises they have a love-hate relationship with. The things coaches say. And what BB100 is actually like.

We could tell you about our gym all day. But hearing from the people who show up here? That’s a better place to start.

Watch their answers, then come form your own opinion.
Tap below or check the link in bio to claim your free week.

First-time members only.

09/15/2026

Try your first week FREE, with no card required.

What if the workout you stick with isn’t the one that leaves you wiped out?

At Black Box 100 in Sussex, you don’t have to give 100% every day to belong.

Low-impact, full-body workouts. Coaches who guide you. Options for how you feel that day.

No jumping. No mirrors. No pressure to keep up with anyone else.
Just time to disconnect, challenge yourself, and build a routine you want to return to.

Tap below or check the link in bio to claim your free week. First-time members only.

09/14/2026

Try Black Box 100 free for seven days. No pressure, no intimidation, just a welcoming space to start where you are.

If you have been putting off the gym because you are worried about keeping up, you are not alone. We have built a studio where classes are small, movements are modified for your level, and you do not need to be fit to walk through the door.

Tap below or check the link in bio to choose your class time and book your first session.

08/30/2026

No mirrors. No judgment. Just people showing up for themselves.

Your first week at Black Box 100 is free. No card, no contract.

📍 Sussex, WI. Link below.

06/23/2026

Workouts with friends are way more fun 💪🏼

Address

N69W25055 Indian Grass Lane
Sussex, WI
53089

Opening Hours

Monday 6am - 4:30pm
Tuesday 5am - 12pm
Wednesday 5am - 4:30pm
Thursday 5am - 12pm
Friday 5am - 10am
Saturday 7am - 9am

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