Final answer:
Regular aerobic exercise does not constrict blood vessels; it increases blood flow, strengthens the heart, and lowers blood pressure.
Step-by-step explanation:
Regular aerobic exercise has been found to have a range of benefits for cardiovascular health. It has been demonstrated to increase blood flow, strengthen the heart, and lower blood pressure. However, it has not been found to constrict blood vessels; on the contrary, exercise typically promotes the health of blood vessels by decreasing the rate of plaque formation and reducing blood pressure, leading to vasodilation rather than vasoconstriction.