I am in the medical field and I can tell you that 128/88 is ok. your diastolic (lower number) is a little high compared to your systolic (top number). Avg diastolic pressure is about 75 or so. Avg systolic is about 120. Diastolic of 90 or higher or a systolic of 139 or higher is a sign of hypertension (high BP). Those numbers will probably change soon, where 85 or higher diastolic or 135 or higher systolic will be considered hypertension. That is already the standard at the hospital where I work. Just do a little cardio workout and cut back on sodium and your diastolic will drop a little.