What are the opening hours?

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

Crossfit Nucleus

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United States
Swansea, IL
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 & 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!!

09/12/2025

We will never forget.
We climbed today for the ones who gave their all.
For the ones who didn’t get the chance to return home that day.
For the ones who ran towards the tragedy.
For the ones that made their last call home.

We. Will. Never. Forget. 🇺🇸💔

08/29/2025

Saturday - 8am Partner
Monday - 8am ONLY (Partner/Hero)
Tuesday - Normal Hours
Have a happy and safe weekend! 🇺🇸

07/16/2025

Nothing says “fun” like a little throw down for some free shoes!! When posted about the “Acid Athletics” challenge, we dove right in!!! A lot was left on the floor …. Haha we are ready for the next one!!!!
📸:

07/13/2025

Sending a big shout out to for completing 300 miles on the Katy Trail this weekend for the Colleen Nesbit Foundation!! We are so proud of you!! 🧡

07/04/2025

Starting off the 4th the only way we know how! 10 or 15 rounds and 22, I mean, some burpees!! Happy 4th of July!! ❤️🤍💙🫡 🇺🇸

07/02/2025

Independence weekend schedule!
Stay safe everyone!
Happy 4th of July! 🫡❤️🤍💙🇺🇸

07/01/2025

Coach Mike Whetstone in his new role at Belleville East High School as a strength/speed & football coach.

Another opportunity for Nucleus to impact more and more lives, getting them fitter and as healthy as possible!

“Just getting started here, SO EXCITED for the school year to get rolling and train as many Lancer athletes as possible!!”
- Coach Mike W

06/25/2025

Those summer time cardio workouts just hit a little different. 🤙🏼
A challenging Run/Row cardio workout today at Nucleus!!

Come get healthier and fitter with us!

02/22/2025

Let’s Run it back!!!
(March sign ups are LIVE!)

The kids have been loving the February classes so we’re going to do it again in March!!

This class is limited to 15 kids aged 8-12.
Cost is only $50 for 4 weeks.
30 minutes (great for busy families) from 5pm to 5:30pm on Wednesday evenings.

Don’t miss out on this super fun class.

Our goal is to teach a foundation of great movements for when more intense weight/strength training comes into your child’s life. The foundation/fundamentals of everything determines how great we can get at anything.
Your kid will learn proper technique on squatting, lunging, deadlifting, push ups, pulling ups, and much more!!
And they will get lots of practice reps!

Don’t forget locomotive movements (running, skipping, crawling, etc.). As we will get them using different locomotive patterns each day to promote overall increased athleticism.

This is the perfect slow paced, foundation setting class for every pre-teen out there.

Come to Nucleus so your kid can get the edge they want! And… we have as much fun as we can, all smiles all day! 😁😁

Sign ups below:
https://www.signupgenius.com/go/10C0E4EAAA92EA4FAC34-55286026-cfnucleus

02/21/2025

The 2025 CrossFit Games Open starts in 1 week! We are so excited for some Friday night lights, dress up themes, PRs, new skills unlocked and so much more!!! Comment below if you’re IN for the open!!

- CFN members, more info will be coming tonight in our page!! If you’re new, make sure to search the “CFN Members Only” page on FB for more!!

02/12/2025

Kids fitness class, ages 8-12 rolling through February week 2 of 4!
30 minutes a week.
Learning proper movement technique for various locomotor skills and strength exercises.
Working in some jumping, speed, agility, coordination, balance, and more.
All while having some fun!

Don’t miss out for the March sessions, $50 for 4 weeks.
Message us to get on the list for March, Wednesday nights at 5pm-5:30pm!

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

Website

http://www.CrossFitNucleus.com/

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Our Story

CrossFit Nucleus is a First-Class facility located at 350 Old Fullerton Road, Swansea, Illinois. SCHEDULE: --Monday-Friday-- 5:00AM-6:00AM (must be reserved) 6:00AM-7:00AM (must be reserved) 9:00AM-10:00AM 12:00PM-1:00PM 4:00PM-5:00PM 5:00PM-6:00PM 6:00PM-7:00PM 7:00PM-8:00PM (Wednesday and Thursday NO 6pm Class, Friday NO 7pm Class) --SATURDAY-- 8:00AM-9:00AM - CrossFit WOD 9:00AM-10:00AM - Midwest Menace Team Training 10:00AM-11:00AM - CrossFit WOD --Sunday-- Closed We have over 5,000 square foot of workout space, locker/shower rooms, inferred Sauna, kids area, plenty of outdoor space to change things up, and much more! 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 relative 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!!