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!!

10/21/2026

A few of our favorite movements all mixed up in a great challenging conditioning piece from earlier this week.
Power Cleans, Front Squats, & Burpees.

Full body. Full Effort. Full Victory.

Come learn how to make fitness fun.
It will be difficult, but it will be fun as well!

10/16/2026

Happy Friday!

You know what that means….
Time to get after it!

Strength:
Front squats
Conditioning:
Thrusters & Burpees

5am class getting a little more fit today.

Message us if you want to try a class for FREE!

10/14/2026

Nothing screams community building like a challenging partner workout that includes lots of time on the Air Bike…

Come get fit and healthy with some new friends!!

10/12/2026

There’s something special about a room full of barbells awaiting their turn in the metcon!! 😅

10/09/2026

Barbells & Bodyweight.

One of our favorite combinations for building strength, improving conditioning, and moving our fitness in the right direction.

Full body movements.
Hard work.
Real results.

Better Every Day.

10/04/2026

Fitness is better when the whole family feels at home. ❤️

At CrossFit Nucleus, we want to be a place where families feel welcome — where parents can work on becoming stronger and healthier, while their kids grow up seeing that taking care of yourself is just part of life.

You don’t have to already be “fit.” You don’t have to be a CrossFit athlete.

Just come as you are. Bring the family. Become part of the community.

Strong parents.
Strong families.
Strong community.

Better Every Day.

09/29/2026

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.

09/18/2026

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??

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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