 Then you have the diastolic pressure, which is the pressure when the heart's at rest. Lub, dub, lub is when it's beating. Lub is when it's resting. Dub, I mean. Beat, rest, beat, rest, beat, rest. Lub, dub, lub, dub. Well, you need to know those numbers if you're going to tell me that you have high blood pressure. I don't usually like telling my patients what to do unless they genuinely ask.