Organic Facts says that "the health benefits of running include the prevention of stroke, diabetes, and hypertension and also lowers high cholesterol level, improves blood clotting, boosts the immune system, reduces stress, and enhances mood." I thought this was especially interesting because it used a new word that I just learned today: hypertension! Hypertension, also known as high blood pressure, is usually caused by too much blood flow pressure in the blood vessels. When we're idle or sedentary, our blood doesn't flow as well as it would be if we were moving around. This causes hypertension, stroke, and coronary heart disease.