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
06/05/2026
Friday = Options. 👊
Some days you’re ready to throw down in a CrossFit metcon. Other days you want to build engine and race through a Hyrox-inspired conditioning session.
That’s why we love Fridays. Two workouts. One goal: helping you train in a way that matches your goals and how you’re feeling that day.
Individualized group fitness.
Show up, choose your path, enjoy the community, and get to work. 🔥
06/04/2026
June 13th 2026! 🗓️ SAVE THE DATE!
•On Saturday June 13th, we are hosting a free bring a friend day!! We would love to meet you!! If your friend is a member, send them a message! If you’re looking to meet some new friends, come on in! Our doors are open!!
-Message us for more info!!!
•Location: CrossFit Nucleus
350 Old Fullerton Rd
•Date: June 13th, 2026
•Time: 8am Workout - social hour to follow
•Cost: FREE
See you there!! 💪🏼
06/04/2026
🔥 FITNESS PEOPLE, WE WANT TO KNOW WHAT YOU’RE THINKING! 🔥
What’s your favorite 40-60 minute cardio grinder using only 2 movements?
Here’s an example:
🏃 800m Run
🚴 1000m C2 Bike
Repeat for 40:00-60:00.
Now it’s your turn 👇
If you had to pick ONLY 2 machines/exercises for a long conditioning workout, what are you choosing and what are the distances/reps?
Examples:
🚣 500m Row + 20 Burpees
🚴 15/12 Cal Echo Bike + 200m Run
⛷️ 500m Ski + 30 Box Step-Ups
Drop your workout in the comments. We want to know what ya’ll “like”, and we might even steal a few for an upcoming class! 😈💪
🔥 FIRST BAR MUSCLE-UP! 🔥
Huge congratulations to Alex on getting his first bar muscle-up! 👏
Moments like this are why we do what we do. Countless reps, failed attempts, sore hands, and showing up day after day finally paid off. The achievement isn’t just the muscle-up—it’s the commitment to the process that made it possible.
What seems impossible today can become your next victory if you’re willing to keep showing up and putting in the work.
If you’ve ever wanted to get stronger, learn new skills, or accomplish something you never thought you could do, this is your sign.
Your first pull-up, your first box jump, your first muscle-up, or your first competition all start with walking through our door.
🚀 Big goals are achieved one workout at a time.
Come join the fun!
Message us if you’re interested in a free trial.
Friday fitness fun. 🔥
A little HYROX-inspired suffering with rowing, sled pushes, wall balls, and power cleans. The kind of workout that gets your heart racing, your legs burning, and somehow still leaves you smiling when it’s over.
Fitness doesn’t always have to be serious. Show up, work hard, cheer loud, and enjoy the process. That’s what Fridays are all about.
Finish the week strong. Sweat a little. Laugh a lot. See what you’re capable of. 💪🚣♂️🏋️♀️
Just the 5:30pm class doing a little conditioning to finish out the session!
Simple & effective couplet with Bike and DB Snatches.
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! 😉
05/16/2026
When metcon shows up …. 😮💨 .. stay tuned for more action shots from the day!!
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!
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 🙌
Click here to claim your Sponsored Listing.
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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 |
