About

Redefining Strength

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Redefining Strength Isn’t Just Our Name. It’s Our Mission.

Because getting older shouldn't mean giving up having a say in how you look, feel and live.

Your body will change. Your goals will change. Your life will change...

The strategy that worked for you at 25 may not be the strategy you need at 45, 55 or 65.

That doesn't mean you're powerless to change it.

It means your strategy needs to evolve with you.

That's what Redefining Strength is all about.

Understanding what your body needs now, why it needs it and when it's time to adjust.

So you can stop jumping from plan to plan...

Stop feeling like you have to start over every Monday...

And build the knowledge, strength and confidence to keep evolving for life.

I'm Cori Lefkowith

I'm the founder of Redefining Strength.

And since 2014, we've helped thousands of women get leaner, build muscle, move better and become stronger at every age.

But Redefining Strength was never supposed to be about simply giving you another workout or telling you what to eat.

It's about changing the way you think about your body...and what you're capable of doing with it.

Because your body will change.

Your goals will change.

Your life will change.

And the strategy that worked for you at 25 may not be the strategy you need at 45, 55 or 65.

That doesn't mean you're broken.

It means your strategy needs to evolve with you.

That's what Redefining Strength is all about.

Understanding WHAT your body needs now. WHY it needs it. And WHEN it's time to adjust.

So you can stop jumping from plan to plan...

Stop feeling like you have to start over every Monday...

And build the knowledge, strength and confidence to keep evolving for life.

 

From California To An International Brand

What started as a strength training studio in Costa Mesa has grown into a global community of women redefining what strong looks like at every age.

Years in Business

Customers

1:1 Coaching Transformations

YouTube Views

I didn't start Redefining Strength because I had fitness all figured out.

I started it because I made just about every mistake myself. 

I was a Division I tennis player.

I became a state powerlifting champion.

I built my career in the fitness industry.

And despite all of that...

I still fell for the idea that harder was always better.

I jumped between diets.

I crushed myself with workouts.

I chased every new tip, trick and "perfect" plan I could find.

I thought getting better results meant being more disciplined, doing more and pushing harder.

Eventually, I realized something:

Knowing more exercises wasn't the answer.

Finding another diet wasn't the answer.

Working harder wasn't the answer.

I needed to understand what my body actually needed — and how to adjust my strategy when my body, goals and life changed.

That realization became the foundation for Redefining Strength.

Not another rigid system you're expected to fit yourself into.

A way to build the right strategy around you.

-Cori Lefkowith

Strength is about so much more than what you can lift.

And transformation is about so much more than how little you can weigh.

Strength is having a body that allows you to live the life you want to live.

It's building muscle instead of sacrificing it just to make the scale move faster.

It's being able to travel, hike, play with your kids or grandkids and say yes to opportunities without wondering whether your body can keep up.

It's eating in a way that supports your goals without feeling like your entire life has to revolve around your diet.

It's knowing when to push harder...

And having the confidence to know when doing more isn't the answer.

And maybe most importantly...

It's understanding your body well enough that one vacation, plateau, stressful month or missed workout doesn't send you all the way back to Day One.

That's the kind of strength we're here to help you build.

Strength for whatever comes next...

What We Stand For

Muscle matters.

We don't believe in losing weight at any cost.

Especially as you get older, we want to help you lose the fat you don't want while building and preserving the muscle you do.

Because you don't just want to be lighter.

You want to be leaner, stronger and more capable.

Your strategy should evolve with you.

Your body changes. Your goals change. Your life changes.

So the strategy that works for you needs to be able to change too.

We don't believe in forcing you into a rigid plan. We believe in paying attention to how your body responds and adapting from there.

Education is empowerment.

We don't just want to tell you what to do.

We want you to understand what your body needs, why it works and when it may need to change.

Because the ultimate goal isn't dependence on another program.

It's confidence in your own ability to move forward.

Consistency beats perfection.

Your strategy needs to work when life is going well...

And when it isn't.

Vacations happen. Work gets crazy. Motivation changes. Life throws curveballs.

Lasting results aren't about being perfect. They're about knowing how to navigate real life without starting over.

Getting older doesn't mean giving up.

We're not going to pretend your body at 50 is identical to your body at 25.

It isn't.

But different doesn't mean doomed.

Your body may change. Your strategy may need to change.

But you still get to have a say in how you look, feel and live.

More Than A Decade Of Redefining What's Possible 

2014

Redefining Strength Opens

Our first brick-and-mortar gym opens in Costa Mesa, California, focused on strength training and truly personalized coaching.

2015

RS Goes Online

Our first digital programs bring the Redefining Strength approach beyond California and eventually evolve into our 1:1 remote coaching experience.

2016

The Redefining Strength Podcast Launches

We begin sharing practical training, nutrition and mindset strategies with a much larger audience.

2017

Cori's First Book

The Macro Hacks brings our adaptable approach to nutrition to readers around the world.

2018

Strong Smart Certification

We begin educating other fitness professionals through our continuing-education certification accredited by organizations including NASM, AFAA, ACE and ISSA.

2019

100k+ YouTube Subscribers

Our free educational content reaches a new milestone as the Redefining Strength community continues to grow.

2020

International Recognition 

The Guardian recognizes Redefining Strength as one of the top online home-training programs.

2021

New Facility Opens

We open our upgraded California training facility for in person events for our online clients.

2022

Our Expert Team Expands

Registered Dietitians and additional specialists join our coaching team, allowing us to provide even deeper individualized support.

2023

Back to back years on the Inc. 5000 Fastest Growing Companies List

Redefining Strength earns back-to-back recognition on the Inc. 5000 list of America's fastest-growing private companies.

2024

Our First Mexico Retreat

Our online community comes together in person for an immersive Redefining Strength experience.

2025

100 Million Youtube Views

Our library of free fitness and nutrition education crosses 100 million views.

2026

The STRONG System

Our proven coaching method, The Strong System, is now a published book. In 2025, Cori signed a deal with Victory Belt Publishing known for producing New York Times bestsellers in the health space to bring our signature framework to the world. It released in January 2026 and became an Amazon bestseller

One coach beside you. An entire team behind you.

Our expert team brings together experienced coaches, Registered Dietitians, Doctors of Physical Therapy and specialists with expertise across nutrition, strength, movement, behavior change and more.

But what ties us together isn't a list of credentials.

It's how we coach.

We listen.

We ask questions.

We pay attention to how your body is actually responding.

And we don't assume the answer to every plateau is to eat less or work out more.

Different backgrounds. Different expertise...One shared philosophy 

Meet you where you are and help you build the strategy that's right for you.

We don't want fitness to take over your life. We want strength to give you more life to live.

You don't need to get your 25-year-old body back.

You don't need to spend your life chasing a lower number on the scale.

And you don't need to fight every change that comes with getting older.

You get to redefine what getting older looks and feels like for you.

Leaner. Stronger. More capable. More confident.

And equipped with the knowledge to keep adapting as your body, goals and life evolve.

Because Redefining Strength isn't about becoming someone you used to be.

It's about becoming strong enough for whoever you want to be next.