Crossfit Nucleus
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A Strength and Conditioning facility using group and personal training to help improve fitness daily! Not just a gym, CF Nucleus is Our Community!
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
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
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®
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!!
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.
Yep.
Strength isn’t just about lifting heavier weights—it’s about building a body that’s ready for everything life throws at you.
At CrossFit Nucleus, we dedicate time each week to developing foundational strength through functional movements like the deadlift. Stronger muscles, stronger bones, better posture, more confidence, and greater resilience—these are the things that improve your quality of life at every age.
Our goal isn’t just to help you get fit. It’s to help you become the most physically capable version of yourself.
Come train with us. Get stronger. Move better. Live better. 💪
07/29/2026
Now that the 2026 CrossFit Games are in the books and we’ve had time to watch every event…
🏋️ Which one was your favorite?
Was it a heavy barbell event? A grinder? A sprint? Something totally unexpected?
Drop your favorite event below and tell us why. 👇 Let’s hear what the CrossFit community thinks! 🔥
High energy. Great people. Zero egos.
You don’t have to do it alone, and I promise fitness can be enjoyed! 😁😁
Just a community getting better every day. Come join us. 💙
PRs poppin on a Tuesday! 🤸🏻♂️
It’s CrossFit Games week!!!
Guess the girl benchmark😉!!
Who is your pick for champs this year?! We are pulling for a repeat for Jayson Hopper for the guys! For the girls - let’s go Ellie Turner!!! 💪🏼
Drop your guesses in the comments!!
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Contact the business
Website
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 |