‘Insen’ is the practice of drinking hot spring water for medicinal purposes. In Japan, there is a whole culture dedicated to using hot spring water to cure various ills, known as ‘Toji’. Insen is one aspect of Toji culture.
Onsen (Hot Springs)
A sauna is a small room within which there are heated stones. Water is poured on these stones in order to generate steam. The resulting steam raises the body temperature of the room’s occupants so that they start to perspire excessively. The birthplace of the sauna is reputed to be Finland.
A Sento is a public bathhouse where anyone can take a bath. Public bathhouses have a long history that goes all the way back to the Edo period. Nowadays most families have a bathtub in their house, so there is little need to use a Sento for bathing purposes, however they have been re utilized as a popular community space.