Ideally, we should all have a blood pressure below 120 over 80 (120/80). This is the ideal blood pressure for people wishing to have good health. At this level, we have a much lower risk of heart disease or stroke. If your blood pressure is optimal, this is great news. By following our healthy living advice, you will be able to keep it this way. If your blood pressure is above 120/80mmHg, you will need to lower it.A healthy blood pressure reading should be lower than 120/80 mmHg. Normal blood pressure is less than 120 mmHg systolic and 80 mmHg diastolic (see blood pressure chart), and may vary from 90/60mmHg to 120/80mmHg in a healthy young woman. A blood pressure of 140/90 mmHg or higher indicates high blood pressure.The first number, called systolic blood pressure, measures the pressure in your blood vessels when your heart beats. The second number, called diastolic blood pressure, measures the pressure in your blood vessels when your heart rests between beats.Diastolic, the lower number, is the pressure between beats. Normal blood pressure is considered to be anything below 120/80. Prehypertension is defined as a systolic reading between 120 and 139 and a diastolic reading between 80 and 89. Hypertension is defined as blood pressure of 140/90 or higher.