Soaking in a bathtub or basking in a sauna can be a pleasant way to relax. Done on a regular basis, both habits may also help prevent heart attacks and strokes, according to several studies.

“The high temperatures in a warm tub or sauna cause your blood vessels to dilate, which lowers blood pressure,” says Dr. Adolph Hutter, professor of medicine at Harvard Medical School. The volume of blood your heart pumps will also rise, especially in a hot tub. That’s a result of the pressure of the water on the body, which increases the heart’s workload, he explains.

https://www.health.harvard.edu/heart-health/hot-baths-and-saunas-beneficial-for-your-heart