The training ground

for health coaches

If you're new here, welcome!
Hope you stretched before this visit.

The Test Kitchen

summer camp is for adults too

Join us for a three-part August intensive for nutrition coaches who want better case formulation, better reads on supporting client autonomy, and to learn how to build beautiful, interactive client dashboards with Claude.


Coaching Test Kitchen

Helping nutrition coaches become experts in

Helping nutrition coaches become experts in

body image 

and eating psychology

The question that drives everything I do: how can the wellness industry be worth trillions, people be stuck dieting for decades, and we all come out the worse for wear?

My take: we’ve gotten really good at creating repeat customers, but not successful ones.

~75%

of individuals aged 16-25 experience body image distress

>80%

of people gain back half the weight they lost in 5 years

125

how many billions of dollars the health and fitness industry is worth

Therapists have it. Dietitians have it. All of them spend years under supervised practice when they begin working with clients. But coaches? They complete a certification, read some books, and are thrown out into the wild to figure it out alone.

Until now.

The Test Kitchen is the training grounds for coaches looking to build expertise in body image and eating psychology. This is the work that separates you from an everyday coach to a high caliber one.

Successful clients = successful businesses

Every helping profession gets supervision... except coaching. 

The Test Kitchen changes that.

A 12-month mentorship for health coaches ready to build their expertise in body image and normal eating so that their clients make health behavior changes that last. Join the waitlist so you're the first to hear when applications open.

The Coaching Test Kitchen

Our Proven Coaching Framework

    I've spent the last 6 years working alongside body image and behavior change experts, mentoring health and fitness coaches build their coaching skills so that their clients can make changes that last.

    The cheat code for successful clients? Understanding why they do what they do so that you can help them actually follow through.

    Meet Your Mentor

    I'm Sarah, the
    eldest daughter of the coaching industry

    I'm Sarah Tierney,
    the eldest daughter of the coaching industry

    Trusted by

    Michelle Carroll, PhD (c)
    Body Image Researcher

    Everything is literally before and after Marguerite for me.

    "Sarah is a behavior change research oracle."

    Karin Nordin, PhD
    Behavior Change Expert

    Everything is literally before and after Marguerite for me.

    "There's nobody that's doing what Sarah is doing with body image and nutrition."

    Kasey Orvidas, PhD
    Mindset Expert

    Everything is literally before and after Marguerite for me.

    "Sarah should run the country."

    Alyssa Olenick, PhD
    Women's Fitness Expert

    Everything is literally before and after Marguerite for me.

    "Anywhere I can, I point women and coaches to Sarah's work on body image."