Exercise is commonly understood to lower blood pressure by making the heart stronger. Mayo Clinic says,
Regular physical activity makes your heart stronger. A stronger heart can pump more blood with less effort. If your heart can work less to pump, the force on your arteries decreases, lowering your blood pressure.
While exercising, though, systolic blood pressure will often go up significantly.
Why does this dramatic increase in blood pressure not damage the cardiovascular system? Stress, for example, can damage the blood vessels,
Increases in blood pressure related to stress can be dramatic. But when your stress goes away, your blood pressure returns to normal. However, even frequent, temporary spikes in blood pressure can damage your blood vessels, heart and kidneys in a way similar to long-term high blood pressure. (Mayo Clinic)
Does daily exercise, for example, not cause "frequent, temporary spikes in blood pressure"?
Why does a blood pressure increase from exercise not damage the cardiovascular system as a similar blood pressure increase from stress (or other sources)?