The Story behind pHuel
Hi, I’m Sybille and I am the founder and CEO of pHule My Fitness. On my 25th birthday, someone said to me: enjoy 25, it’s only downhill from here. A few hours later, in a taxi passing through Union Square, I turned to my best friend Joe and said: “I’m not going to do that, that whole aging thing”. At the time, I only viewed aging through the lens of its inevitable decline. And I made it my point to research how to keep holding on to youth for as long as possible. But I didn’t have a vital part of information back then, one that only comes with age. That aging isn’t defined by a continuous process of deterioration. It is a process of forever growing and evolving into an ever more complex and interesting version of yourself.
Mission
For too long, the science of aging has overlooked women. Most of what we know about healthspan — from fasting and supplements to training and recovery — is based on research done on men. But women are not just smaller men with boobs. Our biology is different. Our hormones are different. And the way we age is fundamentally different.
That’s where this work began.
The idea for pHuel took shape over many years and many versions. But the mission was always clear: to help women navigate aging in a way that’s grounded in science, tailored to female physiology, and deeply human.
My first love was biology and biochemistry — and to be honest, I still get wildly excited about molecules, proteins, and pathways. But somewhere along the way, I realized that knowing how the body works doesn’t help much unless we understand how people work too.
So I shifted my focus. I dove into coaching, behavioral science, and the psychology of change. I studied how we make decisions, what builds trust, and what it actually takes to shift habits in a meaningful, lasting way. That’s when everything clicked — not just professionally, but personally.
This is about healthspan, not just lifespan
Modern medicine keeps us alive longer than ever, but it doesn’t always help us live well. The aches, the fatigue, the sleep disruption, the brain fog, the weight shifts, the emotional rollercoaster — these aren't just annoyances. They're signals. They’re part of a transition many women aren’t prepared for, because nobody taught us how to prepare.
So I went looking for answers.
I studied the big stuff — cancer, cardiovascular health, metabolic disease. But also the small, essential things: how much muscle it takes to climb stairs, how much balance you need to carry groceries, how many years of independence you can gain just by building leg strength in your 40s.
And I looked at how all of it changes with hormonal shifts — before, during, and after menopause.
What I believe
I believe that aging well as a woman isn’t about fear, restriction, or “anti-aging.”
It’s about strategy. About building a life where your body supports you in doing what you love — for as long as possible.
I help women find that balance — between doing enough to protect your future, and not letting health behaviors take over your present. Between living wisely and living fully.
Just like I do in my own life, I help my clients focus on what’s most effective, most accessible, and most aligned with their values — so they can live with strength, clarity, and joy at every stage.