Our founder
Dr. Susanna Søberg
Dr. Susanna Søberg has advised world-class athletes including Cristiano Ronaldo and has been sought out by leading voices in health and performance — from Joe Rogan to Dr. Hyman to Stanford neuroscientist Dr. Andrew Huberman, who named the now-famous Søberg Principle after her. She is the world’s leading authority on contrast therapy, holding a PhD in metabolism from the University of Copenhagen and more than a decade of research in cold and heat exposure. Her work on brown fat activation and thermogenesis has been published in top scientific journals including Cell Reports Medicine and Cell Metabolism, and her bestselling book Winter Swimming has been translated into 14 languages. As founder of the Søberg Institute and creator of the Thermalist Method, she has trained practitioners worldwide and helped thousands improve their health through structured cold and heat exposure, breathwork, and meditation. She has done more than anyone to bridge the science of contrast therapy with real-world practice — and now brings that expertise directly to you.
Our Science Featured In
science backed Contrast Therapy
Our work began with a fundamental scientific question:
What actually keeps humans healthy over time?
Early research focused on how the body responds to stress, temperature, and recovery.
The roots of health - the Clinical relevance
The question was explored in humans examining human brown fat activation and outcomes on metabolism with cold water immersion and sauna. Years of clinical research followed. The goal was not optimisation, but relevance — identifying outcomes that were measurable, repeatable, and meaningful for long-term health.
Scientific validation
In 2021, this work was published in a peer-reviewed scientific journal. The findings confirmed that structured contrast therapy can increase metabolic activity and reduce physiological stress with clinically relevant outcomes.
From research to system
The work continued and the scientific framework was refined, tested, and applied in real-world settings. We have built a system of journeys to reduce stress — science-based, repeatable, and adaptable to human life.
Led by experience and backed by science
Thermalist® are science backed programs built on human biology and years of scientific research. Our programs offer stress reduction and we prove how the body adapts to stress, temperature, and recovery — mechanisms that can be trained to support long-term health.