DISCLAIMER: Wellness service, not medical treatment. Individual experiences vary.

Saunamaxxing: What It Is, What Bryan Johnson Claims, and How to Do It Well

What Is Saunamaxxing?

The essence: Saunamaxxing means using a dry, hot Finnish sauna as a deliberate longevity and recovery practice, and optimising the dose: temperature, duration and frequency. It refers to traditional dry heat at 80–100°C, not infrared, and not a steam room.

"Saunamaxxing" pairs the word sauna with the internet suffix "-maxxing", which means to maximise or optimise something. In plain terms, it is the idea of treating the sauna not as an occasional treat but as a deliberate longevity and recovery practice, and then dialling up the dose: a higher temperature, a longer time inside, more sessions per week, or all three.

The frame matters because the three levers are not equal. The research that made sauna interesting to the longevity world was conducted on traditional Finnish dry-heat saunas at 80–100°C: a hot, low-humidity room with an electric stone heater. That is a different physiological environment from an infrared cabin at 40–60°C or a humid steam room. So when people talk about saunamaxxing, they almost always mean dry, hot, Finnish-style heat, used regularly and with intent.

The appeal is its simplicity. Unlike most longevity ideas, this one is pleasant, requires no equipment of your own, and takes about twenty minutes.

What Bryan Johnson Claims

The essence: Bryan Johnson popularised saunamaxxing. His daily routine is a dry sauna at about 93°C for 20 minutes, but after swallowing a core-temperature pill, he found 20 minutes never crossed the ~39°C threshold he links to heat-shock-protein activation. So his "saunamaxxing" experiment runs much longer, roughly 31–40+ minutes (about 33 with cooling), to get there. These are his personal claims, made within a heavily resourced routine, and they rest largely on observational research.

Most of the recent interest in saunamaxxing traces to Bryan Johnson, the entrepreneur behind the "Blueprint" longevity project, who has documented his routines publicly and coined the saunamaxxing label. It is worth separating what he does, what he claims, and the context those claims live in.

His personal routine. Johnson has described a daily dry sauna at around 200°F (93°C) for about 20 minutes, at low humidity, every day of the week. He deliberately uses dry Finnish-style heat rather than wet or infrared.

The "saunamaxxing" experiment. Beyond the daily routine, Johnson has pushed to much longer sessions: at 200°F (93°C) or above. Using a swallowed core-temperature sensor, he found that his standard 20-minute sessions (across more than 200 of them) likely never crossed about 39°C (102.4°F), the core temperature he links to stronger heat shock protein production (the molecular "repair crew" that helps cells manage stress). Crossing it took him roughly 31 minutes, and about 33 minutes with face/groin ice-cooling or ~40 minutes without: sessions he calls genuinely brutal (he lay on the floor for several minutes afterwards, with heat exhaustion arriving around 135 bpm). He frames it as an ongoing experiment, "the data is still coming in," and still maintains the plain 20-minute version is worthwhile on its own.

Why dry, not wet or infrared. Johnson's argument is that high-temperature dry sauna has the strongest and longest-running body of evidence behind it. He points to long-term Finnish observational research that associates frequent dry-sauna use (four or more times a week) with cardiovascular and all-cause health markers in the studied population, and he describes sauna as one of the most worthwhile longevity practices he has adopted, partly because saunas are widely available and a session is short.

The context his claims live in. Two honest caveats belong right next to those claims. First, Johnson's results are produced inside an unusually resourced system (physician oversight, daily biomarker testing, a large supplement and lifestyle stack), so the specific outcomes he publishes cannot be attributed to sauna alone, and twenty minutes of sauna should not be expected to reproduce them. Second, the underlying research he leans on is observational: it shows associations, not proof of cause, a point we return to in the evidence section.

How to Apply Saunamaxxing

The essence: A sensible routine is 15–20 minutes per round at 80–100°C, one to three rounds, three to five times a week, with hydration and cool-downs, built up gradually. Consistency matters far more than any single extreme session.

You do not need Johnson's daily, extreme version to practise the idea sensibly. The widely shared general protocol (close to what Blueprint itself recommends for other people, and consistent with standard sauna practice) looks like this:

A few principles sit underneath the table:

• Consistency beats intensity. The associations in the research come from regular use over years, not from any single heroic session. A comfortable 18-minute session you will actually repeat three times a week is worth more than a punishing one you dread.
• Daily is not the target. The strongest associations in the Finnish data appear around four to seven sessions a week, and daily use is at the upper end of what most people can sustain safely. More is not automatically better.
• The extreme end is optional and unproven. Deliberately chasing very long sessions to cross a core-temperature threshold (Johnson found it takes roughly 31–40+ minutes of hard heat to reach his ~39°C target) is the speculative frontier, not the established practice. There is no requirement to do it, and good reasons (below) to be cautious.
• Pair it with cold, if you enjoy it. Many people alternate sauna with a cold plunge. Hot first, then cold, is the usual order.

The Pros and Cons

The essence: The pros: it is simple, pleasant, mechanistically plausible and easy to sustain. The cons: the longevity evidence is observational, the extreme end adds risk without proven benefit, individual results are not transferable, and heat is not for everyone.

Pros

• It is simple and pleasant. Few longevity practices are this easy to keep up: walk in, sit in the heat, walk out feeling calmer.
• The mechanisms are real. A hot sauna raises your heart rate to a level comparable with moderate exercise, drives circulation, and activates heat shock proteins, all well-documented physiological responses.
• It suits consistency. A short, repeatable ritual is exactly the kind of habit that compounds.
• It pairs well. Sauna sits naturally alongside cold immersion and a warm-down, making a complete recovery routine.

Cons and cautions

• The longevity evidence is observational. The headline associations come from population studies, which cannot prove that sauna caused the outcomes (see the next section).
• Chasing extremes adds risk, not certainty. Longer and hotter sessions raise the chance of dehydration, light-headedness, and fainting, without a proven extra payoff.
• Personal results are not transferable. A public figure's biomarkers come from their whole system, not their sauna; do not expect to replicate them.
• It is not for everyone. Heat exposure is not appropriate for every person or every health situation. If you are pregnant, feel faint easily, or have any health condition that heat could affect, speak to a qualified healthcare professional first, and stop immediately if you feel unwell.

How Strong Is the Evidence?

The essence: The mechanisms (heart-rate response, heat shock proteins) are well documented. The longevity benefits rest on observational associations, not proof of cause. The "go longer and hotter" extreme is speculative and untested long-term. The evidence supports regular, moderate use far more than extremes.

It helps to separate the claims by how well each is supported.

Well-documented mechanisms (strong). That a hot sauna acutely raises heart rate, increases circulation, and triggers heat shock protein production is established physiology. These are measurable, repeatable responses to heat stress.

Long-term associations (observational only). The reason sauna entered the longevity conversation is a body of long-running Finnish research, following over 2,000 men for two decades, that found associations between frequent dry-sauna use and cardiovascular and all-cause outcomes in that cohort. The pattern was dose-dependent (more frequent use, stronger association), which is noteworthy. But these are observational associations, not proof of causation. Frequent sauna users in Finland also tend to exercise, socialise, and live in particular ways, and a study of this kind cannot fully separate the sauna from the lifestyle around it.

The extreme protocol itself (emerging / speculative). The specific saunamaxxing premise, that going longer and hotter to cross a core-temperature threshold yields extra longevity benefit, does not yet have long-term trials behind it. Johnson himself frames it as an ongoing experiment. Treat it as a hypothesis, not a finding.

The net picture is reassuring and modest at once: there is a reasonable, mechanism-backed case for regular, comfortable dry-sauna use, and a much thinner case for pushing to extremes. The sensible reading of the evidence rewards the easy version.

Our Take

The essence: The evidence rewards regular, comfortable dry-sauna use far more than chasing extremes. Whatever you decide, two things hold: be safe, and, if you want genuinely dry heat, we built a room for exactly that, to our knowledge, one of very few consistently dry saunas in Singapore.

There is a lot of strong opinion online about the "right" way to saunamaxx. We would rather simply lay out what the research shows and what people actually do, and let you decide. The evidence is most supportive of a modest thing: regular, comfortable sessions in a properly hot dry sauna, kept up over time. The longer-and-hotter extremes are the experimental frontier: interesting, unproven, and entirely optional.

Whatever you land on, two things matter to us.

1. Be safe. Heat is genuinely demanding. Hydrate before, between and after, build up gradually, and step out the moment you feel light-headed or unwell. If you are pregnant, faint easily, or have any health condition that could be affected by heat exposure or sustained exertion, speak to a doctor before you start, and especially before any long, hot session.

2. If you want it truly dry, we built it for you. We made a room for the purists: a Finnish sauna kept strictly dry, with no water on the stones, ever, whatever your sauna goals are. That is rarer than it sounds. Almost everywhere else is a shared room where someone ladles water onto the stones every fifteen or twenty minutes, so the air is never reliably dry, and spikes humid each time water is poured. If you want to sit in genuinely, consistently dry heat, to our knowledge, this is one of very few places in Singapore you can. And if you want the opposite (steam, aroma, music and the full ritual), that lives next door, in our Aufguss sauna: a different room at a different temperature, a whole multisensory world rather than dry heat with water added.

Want to feel it rather than read about it? See the two saunas: a strictly dry performance sauna and a multisensory Aufguss sauna in the Singapore CBD.

You can go further on the related guides: sauna for recovery, why dry heat over infrared, sauna versus ice bath, and the Aufguss ritual.

Frequently Asked Questions

What is saunamaxxing?

Saunamaxxing is the practice of using a dry, hot Finnish-style sauna as a deliberate longevity and recovery habit and optimising the "dose": temperature, duration, and frequency. The term was popularised by Bryan Johnson. It refers to traditional dry heat at 80–100°C, not infrared cabins or steam rooms, because that is the range with the longest research history. Wellness practice, not medical treatment.

What sauna does Bryan Johnson use, and how often?

Johnson has described a daily dry Finnish-style sauna at around 93°C for about 20 minutes, at low humidity. He has also experimented with longer sessions aimed at sustaining a raised core temperature. His general recommendation for other people is gentler, roughly 15–20 minutes three to five times a week, and he advises building up gradually. These are his personal claims and routines.

Is saunamaxxing safe?

Regular, comfortable dry-sauna use suits many people, but heat exposure is not appropriate for everyone, and deliberately pushing to very long or very hot sessions increases the risk of dehydration and light-headedness without a proven extra benefit. Hydrate before and after, build up gradually, and exit immediately if you feel dizzy, nauseous, or unwell. If you are pregnant, faint easily, or have any health condition that heat could affect, consult a qualified healthcare professional first. Wellness practice, not medical treatment.

How hot and how long should a saunamaxxing session be?

A sensible session is 15–20 minutes per round at 80–100°C (a traditional Finnish dry-heat sauna), for one to three rounds with cool-downs between. Beginners should start at 10–15 minutes on a lower bench and build gradually. Consistency over weeks matters more than the length of any single session.

Is dry sauna really better than infrared for this?

For this purpose, the case for dry heat is stronger, not because infrared is bad, but because the long-term research that made sauna interesting for longevity was conducted on traditional Finnish dry-heat saunas at 80–100°C. Infrared cabins run cooler (40–60°C) and have a smaller long-term evidence base. If your goal is to follow the research, a hot dry sauna is the closer match.

Does sauna actually extend lifespan?

The honest answer is that we do not know that it causes longer life. Long-term Finnish studies found associations between frequent dry-sauna use and cardiovascular and all-cause outcomes in the studied group, and the pattern was dose-dependent, which is encouraging. But these are observational associations, not proof of cause, and they cannot be separated entirely from the healthy habits of frequent sauna users. Think of sauna as a pleasant, low-risk practice with promising associations, not a guarantee.

Where can I saunamaxx in Singapore?

Sauna Bath House in the Singapore CBD operates a purposefully built traditional Finnish dry-heat sauna at 95°C (the temperature range studied in long-term observational research), one minute from Raffles Place MRT. There are two saunas under one roof: a dry-heat performance sauna and an Aufguss experience sauna, plus a cold plunge, hot pool, and ice shower for contrast. See the sauna page or the current menu for rates.

Where to try it

Sauna Bath House, 50 Raffles Place, Singapore CBD, one minute from Raffles Place MRT. A purposefully built Finnish dry-heat sauna at 95°C, plus an Aufguss experience sauna, cold plunge, hot pool, and ice shower.

See the two saunas · current rates and booking

Wellness service, not medical treatment. Individual experiences vary.

Citations

This guide reports Bryan Johnson's publicly documented claims and routines, and the research context around them. Johnson's specific claims are attributed to him; the underlying physiological and population research is cited separately.

Bryan Johnson / Blueprint (claims attributed to him)

Underlying research context

Note on effect sizes: Large reductions in risk are sometimes quoted for frequent sauna use. These figures come from observational research and describe associations within a studied population; they are not proof of cause and do not predict any individual's outcome.

CTA

Practise it simply, in a sauna built for it.

Traditional Finnish dry heat at 95°C. An Aufguss experience sauna. Cold plunge, hot pool, ice shower. One minute from Raffles Place MRT.

Book at saunabathhouse.com

Wellness service, not medical treatment. Individual experiences vary.