is a bath in a hot air as same as a finnish sauna where the air reaches about 100°C and a very low relative air-humidity around 10-15%. The sauna is in the form of a loghouse located in exterior, best nearby a source of water used as a cooler. The optimal effect comes by a progressive heating followed by an intensive sweating, which is launching all the uncleanness from the body, so with help of metabolism it helps to clean the body in combination with sudden cooling.