Run Strong at 50. Run Strong at 80.

A strength and mobility membership built by a Doctor of Physical Therapy — for active women who plan to keep running for the next 40 years.
Trusted by 70K+ runners. Built on 11 years of clinical practice and the latest longevity research.

You know strength training matters.

But which exercises, why, how much, how often? It feels like a never-ending puzzle.

The women still running in their 70s and 80s aren't piecing together random influencer workouts.

They're doing the right work — for their body, for their sport, for the decades ahead.

This program brings together the latest running, longevity, and injury prevention research.

In a format that actually fits your life.

See Membership Options

✅ This is For You If:

✓ You're 35-65 and you run (or want to) — half-marathons, weekend miles, trail, whatever your distance is

✓ You want to still be doing this in your 70s and know that means working smarter not harder

✓ You've done generic strength work and you suspect you're missing something

✓ You're willing to commit 30 minutes, twice a week, to building the body that lasts

❌ This is Not For You If:

✗ You're currently dealing with pain or injury that needs rehab (I have a different program for that — email me at chelsea@chelseamatthews.co and I'll point you to the right resource)

✗ You want generic, one-size-fits-all workouts you can find on YouTube

✗ You're looking for a quick fix instead of the long game

Select Your Plan

“What started as a fear of never running again has turned into something much bigger…

Before I started working with Dr. Chelsea, running felt out of reach. Now my balance is better, my bones feel stronger, and I'm more confident in my physical abilities than I’ve felt in years.”

-Pilar, Marathon trainee

Why Random Strength Exercises Aren’t Enough
The exercises that support a 30-year-old runner are not the same ones that support a 55-year-old runner.
Most strength programs were built for general fitness or for younger athletes. They miss the things that matter for women who plan to run into their 70s and 80s:

Tendon Resilience

Tendons change with age but the right kind of strength training can reverse this. They need targeted loading to stay springy and resilient - not just general strength work.

Power Output

What predicts whether you'll still be running at 75 isn't endurance - it's your power and strength in specific muscles. Most runners lose power with age without realizing it.

Muscle Mass

Women lose muscle faster after 40, and faster still after menopause. The right strength work doesn't just preserve what you have. It builds new tissue at exactly the time your body wants to lose it.

Bone Density

Your strength work has to load your skeleton specifically, not just fatigue your muscles. The right exercises build bone density. The wrong ones leave you vulnerable to fractures as you age.

What Makes This Different Than All The Free Plans Out There?

Complete a strength & mobility assessment from home — no equipment or appointments needed.

Your results are analyzed by a Doctor of Physical Therapy using the latest running, longevity and aging research.

Every movement is chosen for your needs. No filler. No guessing. No “do this because everyone does it".

You’ll get 6–12 key exercises weekly — so you always know what to do and why. No 47-exercise menus you’ll never finish.

Do your workouts on rest days or cross-training days — they’re designed to fit your running schedule.

Your body changes. Your training changes. Your program changes with both.

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Form Cues That Actually Teach You

Most strength apps give you silent demos and a stopwatch.

You're left guessing whether your knee should track over your toe, whether you’re compensating and whether the exercise is even doing what it's supposed to do.

Inside Catalyst Strength Club, every exercise comes with a video that walks you through:

What to watch for — the compensations that quietly undo the work

Proper alignment — the cues that make a hip thrust actually load the glute, not the lower back

How to progress — when to add load, when to add complexity, when to hold steady

This is the difference between doing exercises and building a body that lasts.

How Catalyst Strength Club Works

Your Path to Stronger, More Confident Running

Step 1: Assess

A 15-minute strength and mobility assessment from your home. No appointments. No equipment beyond what you already have.

Step 2: Get Your Plan

Within 3 days of submitting your assessment, your workouts arrive in a user-friendly app — every exercise chosen for you, with video demonstrations and form cues.

Step 3: Expert Progression

Each month, your program evolves. You don't get stuck. You don't plateau. You build for the long run — literally.

Get a Clear, Focused Plan

What You’ll Actually Do

Wondering how this fits into your schedule?

Most members commit to:

2 strength workouts per week (30 minutes each)
3 walks or runs per week (whatever distance matches your goals)

That’s it. No long sessions. No fluff. A clear plan that fits inside the life you already have.

Hi, I’m Dr. Chelsea Matthews

I'm a Doctor of Physical Therapy and a competitive masters sprinter. For the last 11 years I've worked with runners of every level - from Olympic hopefuls to 83-year-old 5K runners - to build bodies that last.

I built this program for two reasons.

First, the conventional approach is failing women.

Most strength advice for runners stops at "do some squats and planks." That works in your 30s. It doesn't work for the next 40 years, especially not for women whose bodies are navigating real physiological changes that most coaches don't account for.

Second, I've been the woman who thought she'd lost her sport.

I had an injury that made me question whether I'd ever run again. Rebuilding my own running, my own strength, my own confidence - that's what taught me what actually works for women who plan to do this for decades.

What works is specific. Strength chosen for your body, your goals, the changes ahead of you, and the life you want to be living in your 70s and 80s.

That's the work I'm doing here.

You can read more about my background here.

“I assumed I was working all the key muscle groups… until my knees and hips started to hurt.

I thought 'how can I work out this much and still have pain?' Turns out I was doing too many things that weren't adding any value. Now there's no fluff. I spend less time in the gym and I'm seeing significant progress.”

-Amelia, member

Choose Your Membership

Cancel or pause anytime. No long-term commitment.

Somewhere in the back of your mind, there's a question you don't say out loud.

What if I can't keep doing this into old age?

Running isn't just exercise. It's how you think, how you decompress, how you feel like yourself.

This is how you protect it.

Sign Up Today

Frequently Asked Questions

Catalyst Strength Club is designed for runners of all levels. The exercises chosen for you are based on your strength, mobility and goals. Regardless if you’re running 1 mile or an ultramarathon - you’ll find the right level of challenge inside your workouts.
Most members commit to
- 2 × 30-minute strength sessions per week
Every workout is customized based on your unique needs and goals utilizing the latest science and research around strength, prevention and longevity.
For example, while many online workouts will feel challenging - this doesn’t mean they are actually improving strength or reducing your injury risk as a runner.
In fact, the wrong type of workouts can actually leave you more susceptible to unnecessary pain, fatigue or injury. This is why having expert guidance can make all the difference.
Yes. Catalyst Strength Club is a monthly membership but you can cancel or pause anytime. No long term commitment is needed.
It’s recommended that you have resistance bands and either dumbells or kettlebells to get the most out of the program.
No. But you can add these on if you need more support. Please contact me at chelsea@catalystptp.com to learn more.
Your exercises are delivered through a user-friendly app (included with your membership) available for iOS and Android. Each exercise includes a demonstration video, form cues, and the ability to track your progress.
If you're currently dealing with pain or injury, you need rehab, not a strength program. Email me at chelsea@chelseamatthews.co and I'll point you to the right resource. This program is designed for active runners who want to stay pain-free as they age.
Strength Club gives you a structured, science-backed plan that updates monthly. Strength Club Custom is one-to-one programming built specifically for your assessment results, your goals, and your running calendar, with monthly review from me directly.

The Body You’ll Have at 80 Is Being Built Right Now

The women still running into their 70s and 80s didn't get there by accident.

They got there because someone showed them how to train for it — and they put in the 30 minutes, twice a week, year after year.

You can do this.

Choose My Plan

If you're not completely satisfied after your first month, let me know and I'll refund you.