What are the opening hours?

Monday 6am - 8:30pm Tuesday 6am - 8:30pm Wednesday 6am - 8:30pm Thursday 6am - 8:30pm Friday 6am - 12pm

CozmoSize

Real-world Strength & Conditioning programming & facility located in Santa Clarita, CA.

Here at CozmoSize, we train many people across a wide spectrum of fitness levels, all with the fundamental goal of optimizing human performance, athletic development, and real-world strength through functional movement. Our unique programming blends resistance training and conditioning to achieve the fitness goals you have for yourself while boosting morale and building community through training.

We are located in Santa Calrita, CA ,specifically in Old Town Newhall, and offer private and small group training.

08/27/2026

New to CozmoSize Fitness? Come experience our approach to strength training and personal training in Santa Clarita during Labor Day week- on us.

Start with our Labor Day Conditioning Workout on Monday, September 7 at 9:00 AM, and you'll receive:

🔥 Labor Day Conditioning Workout
💪 Labor Day week of training FREE
📊 InBody body composition scan
🏃 Full movement assessment
🧘 Movement Medicine Recovery Session
🏋️ Training inside our coached personal training environment

Over $500 in total value- on us.

This is your opportunity to experience how CozmoSize helps adults build strength, improve body composition and train for long-term health and longevity.

Can’t make it on Labor Day? No problem. You can still take advantage of the Labor Day special. Come in anytime during the week of September 7–12 and experience CozmoSize on us.

Limited spots available. Registration required. DM us for deets!

08/25/2026

You might have the day off from work, but not a day off from getting better 💪😎

Join us Monday, September 7 at 9AM for our Labor Day Conditioning Workout- open to CozmoSize members AND anyone who wants to come experience how we train.

And if you’re new to CozmoSize, we’re giving you a lot more than just one free workout.

Come to Labor Day and you’ll get:

🔥 Labor Day Conditioning Workout
💪 Labor Day week of training ON US
📊 InBody body composition scan
🏃 Full movement assessment
🏋️ All inside a personal training environment

That’s over $500 in value- on us.

Spots are limited, and registration is required.

👉 Sign up through the link in our bio or IG Story to reserve your spot.

Come spend Labor Day with us and see what training at CozmoSize is all about.

08/21/2026

Want to build and maintain lean muscle? 💪

Strength train consistently and make protein a priority.

A great daily target is 0.7–1.0g of protein per pound of body weight.

And after you strength train, make your next meal protein-focused. Give your body the building blocks it needs to recover, rebuild, and get stronger.

Train hard. Eat enough protein. Build muscle.

08/20/2026

Apparently, if you train together long enough… you start dressing alike. 😂

Five people. One training session. Same* shirt.

Totally unplanned. At least we think. 👀

But honestly, this picture says a lot about what makes CozmoSize Fitness special.

It’s the people.

We’re incredibly grateful for the community that has been built inside these walls. People come here to get stronger, move better, and take care of themselves, but somewhere along the way, they also become part of something bigger.

They train together. They push each other. They laugh together. They celebrate each other’s wins.

And apparently… they coordinate outfits now too. 😂

The training brings people in.
The community is what makes CozmoSize, CozmoSize.

We appreciate every single person who chooses to be part of it. 💚🖤

08/16/2026

THE BEST FITNESS PROGRAM ISN’T THE MOST EXTREME ONE.

It’s the one you can actually stick with.

Life gets busy.
Motivation comes and goes.
Vacations happen.
Work gets crazy.
And some weeks simply don’t go according to plan.

Your training shouldn’t fall apart because life happens.

For adults over 40, consistency becomes even more important. You need a program with structure, purposeful progression and coaches who know how to adjust your training to YOU.

That’s exactly why we created the Longevity Strength System at CozmoSize Fitness.

We don’t believe in random workouts or beating you up just so you feel like you did something.

We deliver training, not workouts.

That means:

💪 Structured, progressive strength training
📈 A plan designed to help you continue getting stronger
🎯 Exercises individualized to your abilities
📝 Tracking your progress and training loads
🏋️ Coaches who know when to progress, regress or modify
❤️ A program you can continue for the long haul

Because the goal isn’t to survive today’s workout.

The goal is to build strength that carries over into the rest of your life.

To move better.
Stay capable.
Maintain muscle.
Protect your independence.
And keep doing the things you love for as long as possible.

If you’re looking for personal training in Santa Clarita and want something more individualized than traditional group fitness, we’d love to show you how we train at CozmoSize Fitness.

BUILD STRENGTH. MOVE BETTER. LIVE LONGER.

📍 CozmoSize Fitness | Santa Clarita, CA

Send us a DM or use the link in our bio to book your Discovery Call.

08/14/2026

GLP-1 medications can be an incredible tool for weight loss.

But there’s something the scale can’t tell you-

What kind of weight are you losing?

Because losing WEIGH isn’t the same as losing FAT.

The goal shouldn’t simply be to weigh less.

The goal should be to lose body fat while protecting the muscle that keeps you strong, mobile and capable.

When weight comes off quickly, muscle can come with it. And as we get older, that muscle becomes even more valuable.

Muscle helps you:
💪 Maintain strength
🔥 Support a healthy metabolism
🦴 Support strong bones and joints
⚖️ Maintain balance and stability
🏃 Move better and stay active
❤️ Maintain independence as you age

That’s why strength training while taking a GLP-1 is NON-NEGOTIABLE.
Combine adequate protein with properly programmed resistance training and you give your body the stimulus it needs to hold onto muscle while losing weight.

At CozmoSize Fitness, we use our Longevity Strength System that combines individualized, progressive resistance training with measurable data to help you build and preserve muscle while improving your body composition. We also utilize our InBody body composition scans to look beyond total body weight and track things like skeletal muscle mass, body fat mass and body fat percentage.

So instead of only asking:
“How much weight did I lose?”
We ask the much more important questions:
“How much FAT did I lose?”
“How much MUSCLE did I preserve?”
That’s body recomposition, and especially for adults over 40, those numbers matter.

If you’re currently taking Ozempic, Wegovy, Mounjaro, Zepbound or another GLP-1 medication, don’t just watch the number on the scale.

Protect the muscle underneath it. If you’re interested in learning how to build your muscle while on your weight loss journey, shoot us a DM and we will be in touch!

📍 CozmoSize Fitness | Santa Clarita, CA

08/11/2026

Strength training should be the FOUNDATION of your fitness.

Cardio matters. Mobility matters. Conditioning matters.

But as we age, resistance training becomes non-negotiable.

Why?

💪 BUILD & PRESERVE MUSCLE
Resistance training provides the stimulus your body needs to build muscle—and helps fight the age-related loss of muscle mass.

🦴 BUILD STRONGER BONES
Loading your body through resistance training helps maintain and improve bone strength as we age.

🏋️ CREATE REAL-WORLD STRENGTH
Getting off the floor. Carrying groceries. Lifting luggage. Playing with your kids or grandkids. Staying independent. Strength transfers to life.

🦵 PROTECT YOUR JOINTS
Stronger muscles help support and stabilize your knees, hips, shoulders and spine.

🔥 CHANGE YOUR BODY COMPOSITION
Want to lose fat while maintaining or gaining muscle? Resistance training needs to be a major part of the equation. The goal isn’t simply to weigh less—it’s to have more muscle and less body fat.

⚡ MAINTAIN POWER & FUNCTION
Strength, balance and the ability to produce force become increasingly important as we get older.

And that’s the point:

We don’t strength train just to be better at the gym.
We strength train to be better at LIFE.

At CozmoSize Fitness in Santa Clarita, strength training is the foundation of our Longevity Strength System because we’re not just interested in what your body can do today.

We’re training for what you want it to be able to do 10, 20 and 30 years from now.

BUILD STRENGTH.
MOVE BETTER.
LIVE LONGER.

📍 CozmoSize Fitness | Santa Clarita, CA

08/09/2026

The kids are going back to school.

What if now is the time you finally put your health back on your calendar?

Not for six weeks.

Not until the holidays.

For life.

Our next Longevity Strength System begins August 17, and it’s the perfect opportunity to rebuild the habits that help you feel your best.

At CozmoSize, we help adults 40+:

💪 Build muscle safely
🏃 Move better with less pain and stiffness
⚖️ Improve balance and confidence
❤️ Train for the life you want to live

No random workouts.
No bootcamp.

Just personalized strength training with expert coaching every step of the way.

📅 Next Program Starts August 17

Comment “STRONG” or send us a DM and we’ll tell you how to get started.

06/01/2026

📣📣📣 SCHEDULE UPDATE 📣📣📣 9AM is now open for resistance training M-Th and conditioning on Fridays. If interested in joining us, click LIB, send us a DM, or text us at 661-990-9820 to schedule your complimentary intro session.

03/22/2026

This interview came out a couple weeks ago, and it really made me reflect on how far CozmoSize has come.

From the early days…
to the Conditioning workouts… To the Athletic Club facility
to where we are now in downtown Newhall…

Every phase had its people. And if you’ve ever stepped into a session—past or present—you’re a part of this story.

I’m extremely proud of what we’ve built together.

Really grateful for everyone who’s been along for the ride.

If you’ve been around since the beginning, this might bring back some memories.
If you’re newer, this is a little glimpse into how it all started.

Full interview is up—link is in the bio for the next couple weeks.

Thank you Cozmo Fam 💚

Address

24727 Railroad Avenue
Santa Clarita, CA
91321

Opening Hours

Monday	6am - 8:30pm
Tuesday	6am - 8:30pm
Wednesday	6am - 8:30pm
Thursday	6am - 8:30pm
Friday	6am - 12pm

Telephone

+16613137605

Website

http://www.CozmoSizeFitness.com/

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