Crossfit Nucleus

Crossfit Nucleus A Strength and Conditioning facility using group and personal training to help improve fitness daily! Not just a gym, CF Nucleus is Our Community!
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CrossFit Nucleus is a First-Class facility located in Belleville Illinois. SCHEDULE:

--Monday-Friday--
5:00AM-6:00AM
12:00PM-1:00PM (Tues/Thurs/Friday)
9:00AM-10:00AM
4:00PM-5:00PM
5:30PM-6:30PM

--SATURDAY--
8:00AM-9:00AM - CrossFit Group WOD

--Sunday--
Closed

We have a 9000sqft building designed to improve your health & fitness, or your child’s athleticism. We have CrossFit strength & conditi

oning classes for adults and teenagers. We also specialize in overall athletic development from ages 9-18+ for all sports: football, volleyball, soccer, softball, basketball and more! Message us for details on how you can get an athletic edge on their field or court!!
- Speed - Power - Strength - Conditioning -

We are dedicated to getting people in the best physical shape imaginable. We utilize all aspects of fitness including: running, jumping, lifting, rowing, gymnastics, and everything else imaginable to change our bodies physically. All of our classes are taught by a professional and are extremely motivating to get more out of yourself then you would get alone. Working out in a group will get you better results(physically and mentally), doing full body functional movements will get you better results, constantly varying the workouts will keep getting you results, and working at a higher intensity will force your body to change (physically and mentally). After 3 months of doing CrossFit with CrossFit Nucleus your life will never be the same!!

I mean …. They didn’t actually tell us this … but they were probably thinking it!! 🤷🏼‍♀️
08/19/2026

I mean …. They didn’t actually tell us this … but they were probably thinking it!! 🤷🏼‍♀️

Hands up if you’re excited to get back into the gym tomorrow?!?See ya’ll in class!
08/17/2026

Hands up if you’re excited to get back into the gym tomorrow?!?

See ya’ll in class!

What’s the biggest thing stopping you from reaching your health & fitness goals??Is it nutrition habits or knowledge?Is ...
08/13/2026

What’s the biggest thing stopping you from reaching your health & fitness goals??

Is it nutrition habits or knowledge?
Is it time management stopping you from getting your exercise routine?
Is it lack of adequate sleep each night?

Or do you maybe just not know what it is and it might help to have a professional help you trouble shoot it??

Comment below what is your biggest obstacle and feel free to shoot us a message if you want some free advice or ideas to help overcome those obstacles!!

Our group strength and conditioning schedule.CrossFit. A well rounded strength and conditioning program that never gets ...
08/12/2026

Our group strength and conditioning schedule.

CrossFit.
A well rounded strength and conditioning program that never gets boring or stale.

Consistency mixed with variety to keep every workout fresh while still pushing you towards better fitness and health!

A program where we use full body functional movements to improve strength, power, endurance, coordination, flexibility, and more!!

Individualized workouts in a group class setting, loaded with coaching and guidance to make sure you stay safe and get the most out of your workouts each day.

Also, the others in class are always inspiring, motivating and will no doubt help the gym be the best hour of your day.

If you need proof, message us for a FREE week of fitness with our professional coaches, total body workouts, and awesome community of top notch members!!

Why CrossFit??
08/10/2026

Why CrossFit??

08/09/2026

Saturday mornings are better with the crew. 💪🔥

Good people. Hard work. Loud music. Plenty of laughs.

Had a few take on the Community Cup workout 1, had a few partner it, had a few get after another partner workout, either way we all got some fitness in to jump start our weekend!

Fitness is better with friends, and our Saturdays are always rocking!!

Come for the workout. Stay for the community.

CrossFit Games

Vacation mode looks different for everyone… 🌊Some people are chasing sunrises on the beach.Some are hiking mountains.Som...
08/06/2026

Vacation mode looks different for everyone… 🌊

Some people are chasing sunrises on the beach.
Some are hiking mountains.
Some are hunting down the best local food.
And some are still sneaking in a workout before breakfast. 💪😎

Where’s your favorite vacation destination, and what’s the one thing you always make time to do while you’re there?

Tell us below! ⬇️

CrossFit R.A.D®

Saturdays are about community and building relationships. Grab a workout partner, pick the level of fitness you want to ...
08/01/2026

Saturdays are about community and building relationships.

Grab a workout partner, pick the level of fitness you want to partake in for the day, get moving, smile/laugh often, and get your weekend started right!!

Strength is great.But can you still express that strength when your heart rate is high, your legs are tired, and your br...
08/01/2026

Strength is great.

But can you still express that strength when your heart rate is high, your legs are tired, and your breathing hasn’t settled?

Today’s challenge:
🏃 1-mile run
🏋️ Bench Press Reps

Because real fitness isn’t just how strong you are—it’s how well you can use that strength when it matters.

07/30/2026

Yep.

Address

350 Old Fullerton Road
Swansea, IL
62226

Opening Hours

Monday 5am - 8pm
Tuesday 5am - 8pm
Wednesday 5am - 8pm
Thursday 5am - 8pm
Friday 5am - 8pm
Saturday 8am - 11am

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