But they don’t spend energy so you end up fatter?
Not really, they don’t slow down your metabolism. You’re doing a cardiovascular stress event when you go into the sauna, and when you get out of the sauna, your body is not stressed. It’s like going to the gym just for your heart. So as your heart gets stronger it doesn’t need to work as much to do its job. But your metabolism isn’t down regulated in this event.
Like who has a better metabolism, and is fatter? The guy who goes to the gym everyday and runs 20 km? Or the guy who never runs, and when he walks to the corner store he’s sweating and huffing and puffing?
Okay, interesting!. So ideally, we should get a sauna and then run some laps on the treadmill or viseversa. First run, get tired, then relax and keep the heart pumping.

