SAUNA is artificially created hot or cold ambient temperature in the surrounding of a body! PhysiologyWalla advocates for “Winter Sauna” for better internal organs perfusion with oxygenated blood while slowing down the metabolism for RESTING of the organs and tissues! Summer Sauna, indeed helps to expel out the toxin in sweat and to perfuse the surface tissues including skin! Alternating and changing ambient temperatures as with seasonal changes can be simulated artificially in approachable locations! Welcome and Thanks!