is hot-flue bath with temperature about 80-100°C and very low humidity about 10-15%. Sauna was always not only purifying, but mainly social place. It was used in many important occasions in human life. It was used for childbirth because it was cleanest place. Optimal effect on human body is meet by heating, which is accompanied by intensive prespiration. Intensive prespiration removes impurities which are washed away by swift cooling.