The Thermalist Recovery System Wants to Be Contrast Therapy’s Operating System

Dr. Susanna Søberg wants to sell contrast therapy venues a system. Contrast therapy is one of the fastest-growing categories in wellness and hospitality: cold plunge studios are multiplying, hotels are adding ice baths as headline amenities, and the global cold plunge market reached roughly $380 million in 2025, with sauna and cold plunge equipment sales growing alongside it.

Søberg, the Danish metabolism researcher whose 2021 Cell Reports Medicine paper on cold-induced thermogenesis became the scientific foundation for what is now called the Søberg Principle, believes most of these venues lack one.

Her answer is the Thermalist Recovery System, a licensable B2B platform launched in 2026 that packages staff certification, guided contrast therapy programming, a member-tracking app, and operational support into a single offering for wellness and hospitality operators. It is, in her framing, “a complete contrast therapy operating system.” The system is now launching to selected founding partners worldwide.

The pitch is that operators already have the hardware (saunas, cold plunges, contrast pools) but lack the structured delivery that turns occasional visitors into returning members. Søberg’s argument, laid out in a February 2026 Substack post titled “Growth Without Standards,” is direct: “Equipment alone does not define quality. Delivery does.”

The public materials leave out the details operators need most: pricing, geographic exclusivity, and the distance between the published science and the marketing claims attached to it.

The equipment is half the outcome

The system targets a problem SaunaNews has covered before: the gap between owning a sauna and cold plunge and having a structured operating model around them.

Most contrast therapy venues give guests access to a sauna and a cold plunge, offer basic safety guidelines, and leave them to self-regulate. Søberg’s argument is that this approach produces low retention and missed revenue. “Guests use the sauna and cold plunge once or twice, don’t know how to sequence it, and don’t come back specifically for recovery,” the Thermalist site states. “No differentiation. No ritual. No retention driver.”

The system she is selling includes two structured programs. The first, Thermalist Method, is described as an adaptation program that “brings beginners to adapted in a safe and beneficial way.” The second, Connect+, has almost no public detail beyond its name. Both run in two delivery modes: staff-led sessions (by certified Thermalist instructors) or guided by a pre-recorded sound experience featuring Søberg herself.

Partners also receive staff training and certification, an app for member progress tracking, operational implementation systems, and what the company describes as “ongoing system evolution.” For founding partners, Søberg offers an optional on-site launch day to certify the team and implement the system from day one.

The minimum staffing requirement is two Thermalist-certified instructors per location. Certification is available through the Søberg Institute’s online school, with courses on soeberginstitute.com starting at $357 for cold-water-immersion training and $599 for the full Thermalist Method. A professional in-person workshop for studio owners and business leaders is planned for Sweden in October 2026.

The commercial pitch is built around four metrics: member retention (“members return more when recovery has structure”), new revenue (“premium tier or session pricing uplift”), referral behavior (“distinctive experiences drive word-of-mouth”), and utilization (“existing thermal infrastructure used more”). These are plausible operating-model claims, but none are backed by published case studies, named partner results, or third-party verification.

The science is peer-reviewed. Some claims are not.

The Thermalist system’s credibility rests heavily on Søberg’s 2021 Cell Reports Medicine paper, and that paper is legitimate. The study examined eight experienced male winter swimmers who combined cold-water immersion with sauna two to three times per week, finding that they showed enhanced cold-induced thermogenesis and significantly higher energy expenditure during cooling (500 to 1,000 additional calories per 24 hours) compared to eight matched controls.

The key finding, later named the “Søberg Principle” by Stanford neuroscientist Andrew Huberman on his podcast, is that ending on cold (without external rewarming) forces the body to generate its own heat, potentially increasing metabolic activity. The paper itself does not use the phrase “Søberg Principle”; Huberman coined it during their discussion. Søberg was first author on the paper but not corresponding author (Camilla Scheele, also at the University of Copenhagen, is corresponding author). This is a routine distinction in academic publishing and does not diminish Søberg’s contribution, but the common characterization of her as the study’s sole lead scientist is a simplification.

The clearest gap between the marketing and the published evidence is a claim on the Søberg Institute website that “after just 3 months of following the Thermalist Method, participants experienced a 21% reduction in stress.” This is presented as “our latest data” and “our recent study,” but no peer-reviewed citation, journal name, sample size, or methodology is provided. The 2021 Cell Reports Medicine paper studied metabolic and thermoregulatory outcomes in winter swimmers; stress reduction was not a central finding.

A broader evidence review shows that contrast therapy research is promising but still early-stage for many of the specific claims operators hear most often. The published literature supports measurable physiological responses to structured hot-cold exposure, but it does not yet provide the kind of large-scale clinical data that would make precise percentage claims defensible in a commercial context.

Søberg’s Global Wellness Summit biography separately describes a mission to “help 1% of the world, over 80 million people, reduce stress and cortisol by 20-25% through science-based contrast therapy.” Those percentage targets do not appear in the 2021 paper. Søberg may have internal data or ongoing studies that support these figures, but they are not currently in the peer-reviewed literature.

Three models, three bets

The Thermalist Recovery System enters a market with at least two established comparison points, each making a different structural bet on how contrast therapy reaches paying customers.

The Wim Hof Method certifies individual practitioners, not venues. An instructor completes three modules: an online Fundamentals video course, a $1,699 online Instructor Video Course, and a five-day in-person instructor training (formerly the Master Module). WHM sends full program pricing to applicants by email. WHM instructors then practice independently, bringing their certification to gyms, studios, or private practice. The science backing WHM centers on cold exposure and breathwork (notably Radboud University immunology studies), not metabolic thermoregulation. WHM does not offer venue-level operational systems, member apps, or guided audio experiences.

XPT (Extreme Performance Training), founded by Laird Hamilton and Gabby Reece, took a third approach with XPT Studio: its own studio locations, the first announced for Newport Beach, California, rather than licensing to third-party venues. According to the studio’s 2024 FAQ, group classes fit six to eight people, guided by certified XPT coaches, with ice baths at 42°F or lower and traditional saunas at 185°F or higher. It is a retail brand, not a B2B licensing play.

Søberg’s bet is different from both. Thermalist does not certify freelance instructors (like WHM) or build its own retail locations (like XPT). It licenses an entire operating system to existing venues that already have thermal infrastructure. The model assumes operators have the hardware and are willing to pay for the software: programming, certification, member tools, and brand association with a peer-reviewed scientist.

Building a bathhouse is expensive and complex, and hundreds of venues worldwide already have saunas and cold plunges sitting partially utilized. Selling them structured programming avoids construction risk entirely.

The question is whether operators will pay licensing fees (still undisclosed) for a system whose commercial results have not been independently verified, when lower-cost alternatives exist and some operators are already building their own in-house protocols.

What operators still cannot see

For a system marketed to business operators, the Thermalist Recovery System leaves several commercially material questions unanswered in its public-facing materials.

Pricing and royalty structure: No licensing fees, subscription costs, or revenue-sharing terms are disclosed anywhere on thermalist.com or soeberginstitute.com. Prospective partners must apply and go through a call process before receiving pricing. For comparison, the Wim Hof Method publicly lists the $1,699 price of its online instructor course.

Named partners or case studies: The site confirms that founding partners exist and includes anonymous testimonials, but no partner venue is named. No case study with visit-frequency data, retention metrics, or revenue-uplift figures is available publicly.

Geographic exclusivity: The site states that “intake is selective by region,” which could mean one licensed partner per market area. If so, this is commercially significant: geographic exclusivity increases the value of the license but limits the system’s reach. If not, it is simply a selective intake process. The distinction matters, and it is not clarified.

Connect+ program detail: The second of the two bundled programs has almost no public description. The only characterization available is “our second program.” Operators considering the system cannot fully evaluate the second half of the package.

App functionality: The member-tracking app is listed as a partner benefit, but no screenshots, feature set, or integration details are publicly available.

None of these gaps are disqualifying. Early-stage licensing systems often keep pricing behind a sales conversation, and selective intake is a common strategy for premium positioning. But the public pitch currently offers no verified commercial proof.

The diagnosis is sound; the business case is unproven

The Thermalist Recovery System is a bet that the next phase of contrast therapy will be defined by structured programming as much as by facilities. If Søberg is right that delivery, not equipment, is the competitive differentiator, then operators without a retention-driving protocol are leaving revenue on the table.

The strongest part of the pitch is the diagnosis. Most sauna and cold plunge venues do have an engagement problem: guests try the sauna and cold plunge, feel something, and may or may not return. Structured programming that creates a repeatable ritual, a progression model, and a community layer is a defensible approach to solving that. The aufguss movement in the US and Europe is building operator loyalty through a similar logic: guided experiences that turn a hot room into a reason to come back.

The weakest part of the pitch is the gap between the system’s scientific credibility (which is real) and the commercial claims that are not yet independently supported. Operators are accustomed to wellness brands that lean on science branding without providing the numbers that matter to a P&L: what does this cost, what revenue does it generate, and can someone who has actually run it show the data?

Until Thermalist publishes pricing, names partners, or produces a case study with real operational data, the system asks operators to take the commercial case on faith. That is a reasonable ask during a founding-partner phase and a harder one at scale. Before signing a license, ask for pricing, named partner references, and independently verifiable retention or revenue data.