Spain-based wellness company Slow has reported measurable health changes after running a four-day retreat in Mallorca that turned a group of high performers into what it called a “living lab”. The experiment aimed to test whether a luxury wellness getaway could produce physical and mental benefits that could be tracked, not just felt.
The 10-person programme, co-created with preventive medicine specialist Dr. Angel Durantez, brought together founders, executives and creatives. Participants wore Whoop bands before and during the retreat, and gave blood tests at the start and end of the stay to measure changes in sleep, recovery, stress and biomarkers.
Slow said the results suggested immediate gains for many attendees. For 80% of participants, cortisol levels fell by an average of 8.4%, while most self-reported better energy, sleep and mental clarity.
During the retreat, attendees followed a tightly structured schedule designed to support recovery and reduce stress. Activities included sunrise breathwork and meditation, cold immersion and guided cryotherapy, movement sessions, hiking, restorative practices and a Mediterranean anti-inflammatory diet.
Participants also tracked sleep duration and stages, recovery score, heart rate variability, resting heart rate and strain through their wearables. Slow said the data let it compare each guest’s usual day-to-day metrics with those recorded over the four days in Mallorca.
Self-reported results pointed in the same direction. According to the company, 83% of attendees said their energy improved and 83% reported less body tension. Sleep quality improved for 67%, while 67% also said they felt greater mental clarity.
Half of the group said they were better able to switch off their minds. A smaller share, 17%, reported lower stress and a heightened sense of calm.
The company said the project was intended to test the claims often made by the wellness retreat sector. It wanted to see how those promises measured up against objective data and whether short breaks could deliver visible changes in health markers.
The findings do not prove that every wellness retreat has the same impact, and Slow said its trial did not measure long-term outcomes. But it argued that the results highlighted the immediate effect that lower stress may have on health, especially because stress is closely linked to chronic inflammation and serious illness.
The experiment comes as wellness tourism continues to grow rapidly. More brands are adding wellness-focused services, while luxury hotel groups and specialist operators are investing in programmes aimed at helping travellers unwind, recover and improve their health.
The wider wellness real estate market is also expanding. It is projected to more than double to $1.8 trillion by 2030, with developers adding features such as shared social spaces, padel and pickleball courts, screen-free experiences and meditation areas to appeal to travellers and residents seeking what some call “analog wellness”.
That shift reflects a broader demand for travel products that promise more than relaxation. For many consumers, the appeal now lies in experiences that can show measurable results, from better sleep to lower stress and improved recovery.
