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!!

05/21/2026

Just the 5:30pm class doing a little conditioning to finish out the session!

Simple & effective couplet with Bike and DB Snatches.

The results are in and the winners are:Men’s Winner: Alex M 6:25 Women’s Winner: Emily S 6:40 MVP: Neal G Thank you f...
05/20/2026

The results are in and the winners are:
Men’s Winner: Alex M 6:25
Women’s Winner: Emily S 6:40
MVP: Neal G

Thank you for another fun workout!! 👟 CFN shoe game is getting better every metcon! 😉

When metcon shows up …. 😮‍💨 .. stay tuned for more action shots from the day!!
05/16/2026

When metcon shows up …. 😮‍💨 .. stay tuned for more action shots from the day!!

🚨 Hi everyone! 🚨 With everyone’s safety in mind, we are going to cancel the evening classes today - Monday April 27th. W...
04/27/2026

🚨 Hi everyone! 🚨
With everyone’s safety in mind, we are going to cancel the evening classes today - Monday April 27th.
We will see you all bright and early Tuesday morning! Stay safe!

Sweat, laughs, and a whole lot of good vibes 💪🔥There’s nothing better than showing up, putting in the work, and having F...
04/21/2026

Sweat, laughs, and a whole lot of good vibes 💪🔥

There’s nothing better than showing up, putting in the work, and having FUN while doing it. That’s what it’s all about at CFN••pushing limits, cheering each other on, and leaving stronger every single day.

Come for the workout, stay for the community 🙌

04/18/2026

Two mobilization exercises we use to stretch out our hamstrings and our upper back.

Enjoy!!

03/11/2026

Proof that your class trusts you …. They’ll do anything you throw at them!! 💃🏼

Attention CFN:5am class for MONDAY JANUARY 26th is CANCELLED. The remainder of classes will resume as scheduled unless a...
01/25/2026

Attention CFN:

5am class for MONDAY JANUARY 26th is CANCELLED. The remainder of classes will resume as scheduled unless anything changes. In that case we will send out info ASAP! Stay warm!! ❄️

01/20/2026

Starting the week of with a doozy!!
@

01/14/2026

If you can move your body, you can do CrossFit! It’s for EVERYONE!

Happy Holidays everyone!Here is our schedule for the next two weeks! Keep an eye on socials for any pop up open gyms!! W...
12/18/2025

Happy Holidays everyone!
Here is our schedule for the next two weeks! Keep an eye on socials for any pop up open gyms!! We hope you all have a wonderful end to 2025!! We can’t wait to show you what’s happening in 2026!!! 🎉

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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