“Several studies have shown that frequent sauna bathing (4-7 times per week, 174°F for 20 min.) is associated with a 50% lower risk for fatal heart disease, 60% lower risk for sudden cardiac death, 51% lower risk for stroke, and 46% lower risk for hypertension.
The key word here is sweating. Just because you are in the sauna doesn’t mean you get the benefits. The sauna has to heat your core temperature up a few degrees, your heart rate needs to increase and you need to have a river of sweat, otherwise you simply will not get these benefits. This is important as many infrared saunas fail to heat you sufficiently to achieve these benefits.