The idea that heat exposure leads to calorie burn is rooted in how the body responds to elevated temperatures. When inside a sauna, your heart rate rises similarly to light exercise, which leads people to question again, does the sauna burn calories enough to matter. While the calorie burn is not as high as a workout, regular sauna use may slightly increase daily energy expenditure. This is why many people incorporate sauna sessions as part of a broader wellness routine rather than relying on them alone for weight loss.