Soaking in a portable hot tub is similar to exercise benefits for the heart rate, according to the Mayo Clinic. However, while people who exercise experience higher levels of blood pressure, hot tubs do not cause this. In fact, soaking in an inflatable hot tub will successfully raise your heart rate while actually decreasing your blood pressure. Therefore, soaking in hot water regularly will provide you with a healthy heart and better circulation without any of the cardiac stress exercise can result in.