With regular aerobic exercise, adaptations occur within the cardiovascular system, including increased heart efficiency, improved blood flow, and changes in blood vessel structure. The heart adapts by enlarging its chambers, allowing it to pump more blood with each beat. Additionally, aerobic exercise stimulates the development of new capillaries, enhancing oxygen delivery to muscles. These adaptations lead to lower resting heart rates and improved endurance, contributing to better overall cardiovascular health and increased exercise performance over time.