Why have we always gathered around heat and water?
Almost every culture that could heat a room did — and then filled it with other people.
Heat and water are not a modern wellness idea. Nearly every culture with the means to warm a room built one, and then filled it with other people. We think that repetition is telling us something. People did not keep returning to heat because it was efficient; they returned because of how it left them — looser, quieter, more present, more themselves. The interesting part is not that these practices existed. It is that they kept arriving at the same shape: a sequence, a shared room, and a slow return to the world outside.
The same instinct, over and over
The Finnish sauna began as a smoke-heated earth room used for washing, curing meat, and giving birth — the cleanest space a household had. The Ottoman hammam inherited the Roman bath and rebuilt it around running water, soap and a marble slab where a stranger scrubs your back. The Japanese sentō made bathing a neighbourhood habit; the onsen made it a reason to travel. Russian and Baltic banya added the whisk. Native American and Mesoamerican sweat lodges tied heat to ceremony and speech.
These traditions did not borrow from each other in any neat line. They arrived at similar answers because bodies, water and fire behave the same everywhere. What differs is the etiquette, the architecture and the meaning laid on top.
The room was never only about the heat
Read the accounts and the heat is rarely the headline. The sauna was where Finnish families washed before a wedding and where quiet business got done. The hammam was a women's social institution in cities where few other public spaces were. The sentō was where neighbours learned each other's news. The heat set the conditions — undressed, unhurried, nothing to do — and the gathering did the rest.
That ordering matters. Thermal practice survived for centuries not because anyone measured a benefit, but because it was woven into how people washed, met, mourned and marked things.
What the traditions share
Strip away the architecture and a common structure appears in nearly all of them:
- Sequence. Heat, then water or air, then rest. Never heat alone, and never heat without an end.
- Undress. A levelling that removes rank, uniform and phone at the same time.
- Cleansing. Washing is functional and symbolic at once — the two were never separated.
- Pause. A deliberately empty period afterwards. The part modern schedules delete first.
- Company. Almost always other people, often in silence, often across generations.
What research can and cannot reach
Modern work on sauna bathing is real and worth reading. Long-running Finnish cohort research has reported associations between frequent sauna bathing and lower cardiovascular mortality (Laukkanen et al., JAMA Internal Medicine, 2015), and laboratory studies describe what heat does to circulation, heart rate and thermoregulation with reasonable precision. These are observational and mechanistic findings — good reasons to take the practice seriously, not proof that sauna causes longer life.
But even a perfect study would be measuring one variable inside a practice that was never only one variable. Sequence, atmosphere, low light, the pause afterwards, being touched, being washed, being among people without a task — none of these appear in the outcome column. They may be doing a great deal of the work.
So we hold both. The evidence does not explain everything people feel in the heat. It does give us good reason to trust that something real is happening, and to keep asking what a practice understood for ten thousand years before anyone measured it.
Why this is where TEJ starts
The current wellness market tends to isolate the variable: the temperature, the duration, the protocol. Older thermal cultures did the opposite. They built an environment and let the effects follow.
TEJ begins with Thermal + Contrast because heat and cold are the oldest and most widely shared ritual we have, and because the objects involved — a hat, a towel, a bench, a cloth — have been quietly designed and redesigned for centuries. That is a good place to start asking better questions about material.
Continue reading
- What actually happens to the body in a sauna — the physiology, stated plainly, with the limits of the evidence attached.
- Why does moving between heat and cold feel so powerful? — contrast, cold shock, and the gap between sensation and proof.
- When did wellbeing become something to measure? — what happens to a ritual once it has a score.
Sources
- [1] BBC Culture, 'The 10,000-year origins of the sauna — and why it's still going strong', 2023.
- [2] BBC Future, 'Are saunas and cold plunges good for your health?', 2025 — a readable survey of where the evidence currently stands.
- [3] Laukkanen T. et al., 'Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events', JAMA Internal Medicine, 2015 — observational cohort, association only.
- [4] Hussain J. & Cohen M., 'Clinical Effects of Regular Dry Sauna Bathing: A Systematic Review', Evidence-Based Complementary and Alternative Medicine, 2018.
TEJ is a Clean Wellness Lab in Richmond, London. Our first object is the Heritage Sauna Hat, launching first in the UK.