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Core FSN

4.9
(87 reviews)

Business Details

731 N 17th St., Saint Charles, IL
60174, United States
(630) 524-0023
http://www.corefsn.com

About

Fitness CenterGymPersonal TrainerFitness Classes
Core FSN provides adult group training and youth speed, agility and strength training to the Saint Charles, IL, area. Keeping Physical and Mental Wellness a Priority in Your Daily Life At Core FSN, adults work one-on-one with a trainer and coach or in a group setting. Teen, middle-school and youth athletes have a dedicated space and a team of coaches to help foster their progress. Our classes focus on optimizing strength and improving overall fitness. We also have a dedicated “workout of the day,” and a range of daily classes and sessions. We created CoreFSN to “fit “in with your daily lifestyle, goals, and availability. A healthy way of eating supports a healthy way of living. Core Nutrition is a place to refuel and rebuild post-workout and your destination when you’re looking for a “meal on the go” that won’t be detrimental to your healthy lifestyle.

Location

Core FSN
731 N 17th St., Saint Charles, IL
60174, United States

Hours

Monday5:00 AM - 8:30 PM
Tuesday5:00 AM - 8:30 PM
Wednesday5:00 AM - 8:30 PM
Thursday5:00 AM - 8:30 PM
Friday5:00 AM - 8:30 PM
Saturday6:00 AM - 2:00 PM
SundayClosed

Reviews

4.9
87 reviews
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  • MT
    Morgan Thomas
    Jan 9, 2026
    5.0
    I am absolutely loving my experience at Core FSN! I had never tried small-group personal training before, but it turns out it’s exactly what I needed. Coach Mo and Coach Joe are incredible—knowledgeable, supportive, and always willing to help. They truly take the pressure off and make starting out in the gym feel approachable and comfortable. The community is unmatched. The members genuinely feel like a family, which makes every workout fun & something I look forward to. And as a bonus, being able to grab a protein shake on the way out is such a nice touch. Highly recommend!
  • EJ
    Emily Johnston
    Nov 23, 2025
    1.0
    Me and my boyfriend worked out at Core for almost a year and if you have goals to meet this is the place to be. Joe is great and the extra love and attention he puts in can’t be beat. He knows his stuff! My only complaint was the extra attention from one of the trainers. It was only when my boyfriend wasn’t with me. I was offered sessions outside the gym maybe 3 or 4 times. The discount price was tempting but I had to keep declining. I prefer the safety of the gym . Once you say no that should be respected. I began getting several calls and unwanted text messages. It made me uncomfortable and was creepy. I’m sorry I have to agree with the other people the smell was distracting a lot. The workouts were still top notch . But no means no dude! I would still recommend people give it a try but maybe with a different trainer.
  • JW
    Jennifer Willman
    Feb 26, 2022
    5.0
    The trainers here are fantastic, knowledgeable and caring. The workouts have been great for my Parkinson’s Disease. I love the atmosphere!!
  • EH
    Erin Hardy
    Oct 11, 2021
    5.0
    Core FSN is like no other. I’ve been doing group training in the mornings for over five years consistently, and the attention to detail, personalized programming and outright fun I have there is like nothing a gym has given me in the past. They focus on strength and functional fitness with their adult training, which is what will sustain you for life. I had an injury to my back that required surgery and the training I received there was on point with what it would take to gain my strength and confidence back, and now I’m stronger than ever. It can be intimidating for women to start lifting weights if they’ve never done it before, but the approach Core FSN takes to lifting is what makes women toned and strong, not big and bulky like women may think. Joe, and Mo have created a community at Core that’s a family, where people truly care about each other, support and motivate one another, and are as happy with your successes as their own. The gym is conveniently located in St Charles, has amazing equipment and techniques that cater to any sport for athletes, and is clean and safe to workout in. I’d recommend Core FSN over and over because you won’t have an experience at any gym that even compares.
  • KT
    Katherine Timmons
    Jan 11, 2017
    5.0
    My daugter is in great shape and ready to play softball any time of the year because of Joe.

Frequently Asked Questions About Core FSN

What type of training programs does Core FSN offer?

Core FSN offers adult group training, youth speed, agility, and strength training, as well as one-on-one personal training and group classes focused on optimizing strength and overall fitness.

What are the operating hours of Core FSN?

Core FSN is open Monday through Friday from 5:00 AM to 8:30 PM, and Saturday from 6:00 AM to 2:00 PM. It is closed on Sundays.

Brand Certified Facts from Core FSN

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Certified May 17, 2026Yext Knowledge Graph
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