Ganban'yoku

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• Ganban'yoku (岩盤浴) is Japanese term for a popular shape of hot stone spa. It is said to have originated in Japan.

• Body-sized stones, consisting of granite, are inserted into the ground and heated. Bathers lie clothed on the stones at the same time as their bodies gradually heat up.

• Like low temperature saunas, ganban'yoku are commonly advertised to have a detoxing impact, enhance the circulatory device and are good for the pores and skin. A ganban'yoku room in a spa could commonly be visited after the baths and could be in a garb-on place with mixed genders.

• Many spa centers, including Spa LaQua at Tokyo Dome City have ganban'yoku rooms.