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 & conditioning 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!!
Strength is an important part of our program.
There’s plenty of ways to get stronger and today we used a few different variations of shoulder to overhead barbell exercises to work on our upper body pressing strength, stability, and mobility.
We all have limitations but if we never work on them then we will never realize our full potential.
At CrossFit Nucleus we use what you have each day to work on your fitness and find ways to improve or learn different ways to keep raising your limits.
Sometimes it might be overhead shoulder mobility, sometimes it might be the coordination to jump rope, sometimes it’s the confidence jumping on a small box, or sometimes it’s just the ability to get on and off the floor. Either way we’re all trying to just be a little better than yesterday!
Our classes are for everyone and we have the best coaches to make sure you are getting what you need whether you’re an ex-college athlete or you haven’t exercised in 15 years.
Message us if you want to see what it’s all about!!
09/23/2026
One way we can get some insight on your squats …. Squat therapy!! It helps you feel it and us see what we can improve!!
How close can you get to the wall without touching or falling?? Test it out and and tag us in your video.
Tempo Bench press to jump start the Friday training session.
Because strength matters.
We always focus on some general strength movements by themselves a few times each week so we can truly improve our strength, because stronger people are harder to kill!
Come lift and condition with us.
Message us for a free trial!! 🤙🏼🤙🏼
09/17/2026
The Echo Bike. 🚴🏼♀️🚴🏻♂️
One of the few machines we use, but arguably one of the most effective at driving fitness and burning calories!
The echo bike has definitely left some memories for most CrossFit veterans.
Let’s hear about your most memorable moment on the Rogue Fitness Echo Bike??
The workout matters… but it’s not really about the workout.
Tonight it happened to be wall balls. Tomorrow it’ll be something different.
What matters is having a group of people who show up regularly, work hard together, encourage each other, and make doing hard things a whole lot better.
That’s what makes CrossFit Nucleus special.
You don’t have to be the strongest. You don’t have to be the fittest. You just have to show up — and you’ll have a whole community beside you doing the same thing.
The Nucleus community is unmatched. 💪
Come experience it for yourself.
Better Every Day. Together.
09/15/2026
This is what showing up looks like. 💪
Putting in the work, trusting the process, and getting stronger one rep at a time.
We love watching our people realize they’re capable of more than they thought. Keep pulling. Keep growing. Keep showing up.
Better Every Day.
09/09/2026
Some workouts aren’t just about getting the work done… sometimes you’ve gotta make it a RACE. 🚣♂️🔥
Long rowing workouts can get monotonous, but throw a partner next to you and suddenly every meter matters.
Today we lined the rowers up, picked a target, and let a little friendly competition take over. Chase the rower next to you. Make a move. Respond when they make theirs. See who has something left when it starts to hurt.
That’s one of our favorite things about training at CrossFit Nucleus — hard work doesn’t have to be boring. A good workout, a little competition, and people beside you pushing you harder than you’d push yourself.
🚣 Long row
🤝 Partner beside you
🏁 Race to the finish
Fitness is better when you’re not doing it alone.
CrossFit Nucleus.
CrossFit is Healthcare.
We work multiple body parts each day, improve all your energy systems, increase muscle strength & mass, work flexibility daily, build confidence in yourself, hangout with some cool people, all while having fun for an hour a day!
08/19/2026
I mean …. They didn’t actually tell us this … but they were probably thinking it!! 🤷🏼♀️
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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 |
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