COEFFICIENT CROSSFIT · ST. CHARLES, MO
Find your constant.
Close-knit community. Expert coaching. Top-tier facilities. Join us in the pursuit of improving ourselves and each other. Every, single, day.
Coefficient Hybrid Flash.
Race-day practice for Hyrox and other hybrid events: learn how to pace, how to transition, and how to keep moving when your legs are on fire.
CrossFit classes, free childcare, and more included.
Our commitment: the most effective methodology for comprehensive fitness.
Coefficient is grounded in the CrossFit methodology: data-driven, measurable and repeatable, built on constantly varied functional movement at high intensity.
Every class is coach-led and 60 minutes, built for adaptation to any athlete, no matter the athletic background, age, or capabilities. In-house programming is led by Head Coach Joe Aiello.
Free childcare
A dedicated kids area with background-checked staff. Always free for all CrossFit classes except weekday 5:00am and 6:00am.
Free childcare details →Extra classes.
- Motherhood StrongCoach Joselyn Miller's prenatal and postpartum training, with childcare available.
- Olympic WeightliftingDedicated Oly classes Tuesday–Thursday evenings and Saturday mornings.
- Hybrid Flash New · NovHyrox-style race-day practice twice a month.
- Mobility Nov · dates TBAWith Amber Buckley, PT: 2 classes a month, each on one area of the body.
- Flexibility Nov · dates TBAYoga-based flexibility with Leah Campbell, 2 classes a month.
- Release & Restore Yoga NewA gentle, yoga-inspired class for moms and women with Kristin Phommally, RYT-200. Every other Thursday at 10:25am.
2 paths to get started.
01 · BeginnerStart with Fundamentals.
The Fundamentals program consists of two separate 60-minute sessions that you schedule directly with our coaches.
- Contact usFill out the Get Started form and our coaches will reach out ASAP.
- Schedule your 2 Fundamentals sessionsTwo 60-minute sessions, scheduled directly with our coaches.
- Learn the foundationsGet trained on the foundational movements and techniques you'll need to jump-start your CrossFit journey.
- Start your membershipThere is no charge for Fundamentals. Getting started just requires you pre-pay your first month of membership, which begins after Fundamentals is complete.
02 · ExperiencedTry a free class.
We invite anyone with 6+ months of CrossFit to experience a full CrossFit class with our community, coaching, and facility. Come see what all the hype is about!
- Book your free trial classFor anyone with 6+ months of CrossFit experience.
- Experience class for yourselfExperience our community, coaching, and facility.
- Start your membershipWant to skip the trial? Start your membership right away.
Or email us at info@coefficientcrossfit.com
Do Hard Things.
Those who thrive aren’t the ones who avoid the hard stuff — they’re the ones who face it head-on.
You’re not just joining a gym. You’re joining a family that does hard things — together.
Start your commitment →In the heart of St. Charles.
Just south of I-70 and only steps away from the Streets of St. Charles and the Katy Trail.
St. Charles, MO 63303
info@coefficientcrossfit.com
Get directions
Find your constant at Coefficient.
Start with Fundamentals, a free trial class, or a free Saturday.