Blood pressure is a good indicator of the overall health of your cardiovascular system. Blood pressure is the pressure exerted on the walls of your blood vessels by your blood as pumped by your heart. IF your blood pressure is elevated, your heart has to work harder to pump the blood through your body. High blood pressure is serious and can be life threatening, so check with your physician if you have a family history. Low blood pressure can cause dizzy spells and fainting, so try to keep an eye on your blood pressure and keep it within the normal range of 90-120 over 60-79.