When researchers looked at the habits of 2,315 middle-aged men, they found that those who logged 4 to 7 weekly sessions were 50% less likely to develop fatal cardiovascular diseases and 40% less likely to die young. MORE: The 25 Best Diet Tips Ever The longer the sessions (up to 35 minutes), the greater the benefit, according to the study published in JAMA Internal Medicine. Women are likely to see similar results—which, by the way, have nothing to do with sweating out toxins. Sauna time raises your heart rate to levels on par with moderate-intensity exercise, the researchers say. Exercise benefits while sitting still? We’re sold.