A sauna is a small room or building designed as a place to experience dry or wet heat sessions, or an establishment with one or more of these facilities. The steam and high heat make the bathers perspire. Saunas can be divided into two basic types: conventional saunas that warm the air or infrared saunas that warm objects. Wikipedia
One of the benefit of sitting in a hot room is that it gets your heart working faster which pumps the blood harder, and to accommodate this increase in blood flow, the blood vessels expand, resulting in a temporary lowering in blood pressure. In other words, by getting your heart worked up, you’re calming down your blood pressure.
1. Improved Blood Circulation