Ganban'yoku
Ganban'yoku is the Japanese term for a popular form of hot stone spa. It is said to have originated in Japan.
Body-sized stones, such as granite, are heated into the floor. Bathers lie clothed on the stones while their bodies gradually heat up. Wikipedia
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岩盤浴とサウナどちらが体に良いですか?
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岩盤浴は週に何回くらい入ればいいですか?
岩盤浴とサウナは同じ日にできますか?