Kauppinen (2006) Facts and Fables about Sauna
Sauna baths are safe for healthy individuals of all ages, including expectant mothers in uncomplicated pregnancies. They provide a cardiovascular workload similar to brisk walking and pose no circulatory risk. Stable cardiovascular patients can also safely use saunas. Essentially, if one can walk into a sauna, they can walk out. Misuse is discouraged.