What are the opening hours?

Monday 6am - 9pm Tuesday 6am - 9pm Wednesday 6am - 9pm Thursday 6am - 9pm Friday 6am - 9pm Saturday 7am - 7pm Sunday 7am - 5pm

Core Dynamics Gym

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United States
Water Mill, NY
Core Dynamics Gym

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Core Dynamics is an exclusive fitness club for the serious fitness enthusiast. Top personal trainers and fitness coaches, massage therapy and pilates.

10/23/2026

Are you training for your body, or just guessing?

PNOĒ metabolic and VO₂ max testing takes the guesswork out of fitness by giving you a better understanding of how your body actually works.

Through a simple breath analysis, you can learn how efficiently your body uses oxygen, how it burns fat and carbohydrates for energy, and where your optimal heart rate zones fall.

Whether your goal is to lose body fat, improve endurance, build strength, or simply train more efficiently, understanding your metabolism is a great place to start.

Core Dynamics is currently offering $50 off combined PNOĒ metabolic and VO₂ max testing.

10/06/2026

Over 20 years ago, Jim O’Hagan fell in love with this space and turned it into something truly special.

Today, Core Dynamics lives inside a beautifully renovated potato barn and water mill, creating a gym that feels less like a traditional gym and more like a place where people actually know you.

It’s small enough that you’re not fighting over machines or getting lost in a crowd. The trainers have been here for years, building real relationships with their clients and bringing experience you can trust.

There’s something rare about having a place where you feel comfortable, safe, cared for and genuinely welcome.

If you’ve been thinking about joining a gym, consider Core Dynamics in Mattituck. Beautiful surroundings, professionalism, cleanliness, convenience and privacy, without the chaos of a big box gym.

Sometimes the best places are the ones that still feel personal.

08/30/2026

Meet Jim Mac.

With over 20 years of hands-on experience in fitness, performance, and longevity, Jim brings a rare combination of education, experience, and real-world grit.

A Master’s graduate in Sport Management, NASM-certified across multiple specialties, and a Brazilian Jiu-Jitsu black belt, his background goes far beyond the gym floor.

From Ironman finishes and Boston Marathon qualification to winning the MightyMan Sprint Triathlon, Jim doesn’t just coach performance—he’s lived it.

Experience matters. And when you’re training for strength, performance, and longevity, who you train with matters too.

Core Dynamics is extremely grateful to have Jim Mac as part of the team and for the experience, knowledge, and dedication he brings to our members every day.

This is training built for the long game.

08/24/2026

There’s something to be said for experience. 💪

At Core Dynamics, owner Jim O’Hagan is proud that many of his trainers are older—and that’s very intentional.

With age comes experience. An understanding of how the body changes, how to train smarter, how to stay strong, and how to build fitness that actually supports you through every stage of life.

Our trainers don’t just teach it—they live it. They’re strong, fit, take care of themselves, and show their clients what’s possible when you continue to prioritize your health as you age.

Because getting older doesn’t mean getting weaker.

It means training smarter, staying consistent, and having the right people in your corner.

08/19/2026

Strength for Life.

It’s more than a slogan at Core Dynamics—it’s the foundation of how we train.

Research continues to show that cardiovascular fitness, VO₂ max, muscle mass, strength, and body composition all play an important role in long-term health and longevity.

That’s why Jim is such a strong advocate for building—and maintaining—muscle and strength throughout your entire life. And it’s why knowing your VO₂ max is such an important part of creating smarter, more individualized programming.

You can’t improve what you don’t measure.

Schedule your VO₂ Max test today and get on a customized program designed to improve your health, strength, and longevity.

Train for today. Build Strength for Life. 💪

08/13/2026

Jack Kloster has been part of the Core Dynamics Training team for about three years, bringing a strong background in powerlifting that comes through in his approach to training.

Jack is focused on helping his clients build real strength and muscle while staying true to the Core Dynamics philosophy: move smart, move well, and build a body that performs.

He’s become an essential part of our team, and we’re proud to have him at Core Dynamics. 💪

08/07/2026

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Some places have great equipment. Others have great people.

At Core Dynamics, it’s both.

Jim O’Hagan has built more than a gym—he’s built a community where people are welcomed, supported, challenged, and celebrated. Whether you’re just getting started or chasing your next goal, you’ll find coaches who genuinely care and a team that’s rooting for you every step of the way.

If you’ve been looking for a sign to prioritize your health, this is it. 💪

07/30/2026

Not every workout is designed for every person.

After more than 20 years in functional fitness, Jim’s approach has always been simple: build strength safely, progressively, and with good technique.

CrossFit is a sport with highly skilled athletes who spend years developing the movement patterns and conditioning required to perform at a high level. The challenge comes when everyday gym-goers try to chase the clock or squeeze out “just one more rep,” often at the expense of proper form.

The goal isn’t to move the most weight as fast as possible—it’s to move well, stay healthy, and keep getting stronger for years to come.

Fitness isn’t about surviving today’s workout. It’s about still feeling strong enough to train tomorrow.

What are your thoughts?

07/27/2026

**WE’RE HIRING!** 🚨

**Part-Time Front Desk Associate**
📍 **Core Dynamics Gym | Water Mill**

Looking for a great part-time job in a positive, energetic environment? Join the team at Core Dynamics Gym!

**What we’re looking for:**
✔ Friendly, outgoing personality
✔ Reliable and punctual
✔ Professional demeanor
✔ Basic computer skills
✔ Available weekday afternoons and some weekends

**Responsibilities include:**
• Greeting and checking in members
• Scheduling appointments
• Answering phones
• Helping keep the gym clean, organized, and welcoming

💪 **Perk:** FREE gym membership!

💲 **Pay:** $17.00–$18.50 per hour, based on experience.

Interested? Email your resume to **Ann Meras** at **[[email protected]](mailto:[email protected])**.

Know someone who’d be a great fit? **Tag them or share this post!**

07/17/2026

How fit are you… really? 👀

The VO₂ Max test at Core Dynamics takes the guesswork out of your training. Instead of relying on watches or estimates, this test measures exactly how your body uses oxygen during exercise, giving you real data about your cardiovascular fitness.

Whether you’re training for a race, looking to improve your endurance, or just want a better understanding of your health, this is one of the most valuable fitness assessments you can do. You’ll walk away with personalized heart rate zones, calorie burn data, and a clear roadmap for how to train more effectively.

Big thank you to the team at Core Dynamics for walking me through the process. If you’ve ever been curious about your fitness level, I highly recommend giving it a try.

Have you ever had your VO₂ Max tested? 💪📈

Address

Water Mill, NY

Opening Hours

Monday	6am - 9pm
Tuesday	6am - 9pm
Wednesday	6am - 9pm
Thursday	6am - 9pm
Friday	6am - 9pm
Saturday	7am - 7pm
Sunday	7am - 5pm

Telephone

+16317266049

Website

http://www.coredynamicsgym.com/

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