21 posts
Seven apps that log sauna, cold plunge, and bath sessions from an Apple Watch, side by side. What each records on the wrist, what it costs, and why Furolog, which is ours, is the one to pick if your visit includes water as well as heat.
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岩盤浴 is a Japanese heat format that is not a sauna and not a bath: you lie on heated stone slabs in a 40°C room, dressed, for a long time. What it is, how a session goes, what it does to heart rate compared with a sauna, and what the watch makes of it.
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What to bring, how long to stay, whether to try the cold bath, and how to rest. A practical first-sauna guide that puts symptoms ahead of timers and watch readings.
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You did the sauna, cold bath, and rest, but the feeling never arrived. Here are seven things to review, using your heart-rate chart as a clue rather than a diagnosis.
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ととのう is the calm, floating state after sauna, cold water, and rest. It has a shape on a heart rate chart: a climb, a cliff, and a dip below where you started. What each part is, why it feels the way it does, and how to tell a real one from a near miss.
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Five to ten minutes is the standard, and it is the part of the cycle everyone cuts short. What happens in the first two minutes, why the rest is where the good feeling comes from, and the single clearest signal for when it is done.
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Six to twelve minutes is what every guide says. It is a fine starting point and a poor rule, because the room changes and the number does not. What the minutes are for, when to ignore them, and how to leave by heart rate instead.
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Every Finnish sauna has a small guardian living behind the stove. Where the belief comes from, what he punishes, what you leave him on Christmas Eve, and why his rules read like a safety checklist.
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Kiuas, löyly, vihta, lauteet, avanto, saunatonttu. A glossary of the words you will hear in a Finnish sauna, how to say them, what they mean, and the Japanese sauna word that comes closest.
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A cold beer on the porch after the last round is as Finnish as the sauna itself. What the tradition actually is, what alcohol does to your heart rate in the heat, and how to keep the beer and skip the risk.
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The oldest public sauna still running, the largest smoke sauna, the seaside architecture in Helsinki, the free one on the shore. A short list of Finnish saunas worth a trip, and what to expect at each.
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A bundle of birch branches, soaked and used to slap the skin in the heat. What it does, how it is made, why half of Finland calls it vasta, and what your watch makes of it.
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Finland has about three million saunas for five and a half million people. Here are the kinds you will actually meet, how each one feels, and how they compare with the Japanese sauna you may be used to.
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Wood, electric, or smoke. Continuous or once-heated. A heap of stone or a thin tray. The kiuas decides what kind of heat you get, and a Finn will judge a sauna by it before anything else.
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Löyly is the burst of steam when water hits the stones, and the word once meant spirit or breath. What it does to the room, to your heart rate, and how to throw it without annoying anyone.
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Your watch says you burned 400 calories sitting still. It is counting your heart rate, and in a sauna your heart rate is lying to it. Here is what is actually happening and what is worth measuring instead.
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Alcohol, some medications, pregnancy, and heart or blood-pressure conditions may change whether sauna is appropriate. Learn when to skip it and when to ask a clinician.
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The standard answer is 8 to 12 minutes, 1 to 2 minutes, and 5 to 10 minutes. The better answer comes from your heart rate. Both are here, with what to do on your first day.
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A sauna pushes your heart rate to 100 to 150 bpm without you moving. Here is what the research says is typical, why it happens, how to set a personal limit, and what a good recovery looks like.
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Apple's sauna guidance is more specific than "don't". Here is the exact rule for each model, what heat really does to the watch, and how sauna regulars wear one anyway.
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Not every Apple Watch can measure the water it is in. Here is which models have the sensor, how it works, and why it matters for logging onsen and sauna sessions.
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