When you exercise in water, water resistance helps blood circulate more effectively throughout the body. This in turn reduces blood pressure and, in the long run, also reduces resting heart rate.

At the same time, aquatic workouts are a great way to build up cardio endurance.

A study published in the Asian Journal of Sports Medicine reports that a 10-week course of water aerobic exercise markedly reduced the systolic and mean arterial blood pressure of patients with essential hypertension and is especially recommended for the obese.