Chew and swallow an aspirin while waiting for emergency help. Start CPR if the person is unconscious. Rest will ease pressure on the heart as it tries to pump blood throughout the body. Staying active and exercising regularly will lower blood pressure by keeping your heart and blood vessels in good shape.
Regular exercise can also help you lose weight, which will help lower your blood pressure. The AED (automated external defibrillator), as with CPR, should only be used when a person has a cardiac arrest (see point 3 above on Do not apply pressure to the chest).