Is it normal to have a high pressure of 100 and a low pressure of 66?

A high pressure of 100 mmHg and a low pressure of 66 mmHg is normal blood pressure.
The lateral pressure on the vessel wall caused by blood flowing through the vessels is called blood pressure, which is categorized into systolic and diastolic pressure according to the different states of contraction and diastole of the heart.
Systolic blood pressure is the heart in the contraction of blood ejection pressure within the arteries, usually 90 ~ 140mmHg, due to the value is greater than the diastolic blood pressure, often referred to as high pressure; diastolic blood pressure is the heart diastole, blood vessel elasticity of the pressure generated by the retraction of the blood vessels, usually 60 ~ 90mmHg, referred to as low pressure.
High pressure 100mmHg in the normal range of systolic blood pressure 90~140mmHg, low pressure 66mmHg also in the normal range of diastolic blood pressure. Therefore, if this blood pressure is measured in a quiet, awake state, the blood pressure is normal.
If the blood pressure is measured after strenuous exercise, it is considered to be on the low side, and it is recommended to measure it again in a sober and quiet state. If it is within the above normal range, then there is no problem; if it is lower than the above normal range, it is recommended to go to the hospital as soon as possible to see a doctor, to clarify whether the blood pressure is abnormal or not.