You Got Goals? We Got You.

Ready to achieve your goals but don’t know how? That’s where we come in. Our expertly programmed workouts kick the guesswork and intimidation to the curb. Join us at The Den for results focused, smart, dynamic training led by instructors who turn your potential into results you can see and feel. 

Meet the team

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Kid’s camp

Drop off your kids and focus on your workout with peace of mind. Designed for kids ages 6 weeks –12 years, Kids Camp is a fun, safe and stimulating environment supervised by trained caregivers.

Enjoy high-energy classes while your child has a blast in the Kid’s Camp!


Frequently Asked Questions

Everyone fits. Everyone is welcome. Everyone gets equal attention. Fitness is about working to your personal potential, so we design all of our workouts with tons of variations for all levels. It’s kind of a core principle for us.

Absolutely. We offer a free 3-day trial. Book online, walk in, or give us a call.

Yes, we do. We have brand new locker rooms with changing stalls and fantastic showers. Lots of privacy, lots of space. Less highschool, more Hilton.

We celebrate you during every phase of life. Chat with your Den Leader before class so they can provide options that fit for you. We recommend consulting with your Doctor before starting a new fitness routine while pregnant.

All you need: 1) Gym shoes 2) Activewear 3) Your hustle
P.S. Towels are provided.

Strict. We clean all equipment before and after classes. We pride ourselves on cleanliness. Just because it’s a gym doesn’t mean it has to smell like one. You can always grab a gym wipe anytime you’d like. Nothing wrong with a triple wipe.

It’s really easy. Just create an account with basic info to book a class online or on our upcoming app. If that’s not your bag, email us at [email protected] or call us at 224-655-7981. We’ll set you up.

We keep it simple with three membership plans: Strong: (4 classes per month), Stronger: (8 classes per month), and 3) Strongest: (Unlimited classes)

Try to get here about 15 minutes early so we have plenty of time to show you around the studio and set you up for success. We’ll ask questions about any injuries or issues so we can make sure you get fit and stay safe. A friendly Den leader will be there to make sure you’re comfortable and ready to go. Ask us anything!

Yes! Cars, trucks, SUVs, scooters, bicycles, unicycles and other vehicles, whether motorized or self-propelled, are kept safe and sound in our brightly-illuminated parking lot while you work out.

Let us know 12 hours before class. It’s no big deal. Depending on your membership, we do charge a small fee of $10 for cancellations within that 12-hour window.

In Fitness, Community Matters.

We’re Todd and Natalee Zehrer, and The Den is our dream. Combining our passion for fitness and community, we are here to inspire you, motivate you and host you in our second home. We are Crystal Lake natives but spent a good portion of our young adult lives in NYC and Chicago where I (Todd) honed in on my passion for training others. I worked at some of the top boutique fitness studios and dreamed of taking all that knowledge back home to the ‘burbs. Our family is loving being part of the 60010 community.

We created The Den for everyone- kids and grown ups alike! We want each member of our community to feel at home here.

You’re going to love it, we know it. We can’t wait to meet you!

Join us at The Den. You can get started with a free 3-day trial. Let’s get to work!