How does regular aerobic exercise improve cardiac output

Could you elaborate on the physiological adaptations that occur in response to aerobic exercise training, including cardiovascular, respiratory, and metabolic changes? How does regular aerobic exercise improve cardiac output, stroke volume, and oxygen delivery to working muscles, resulting in enhanced endurance and aerobic capacity? Additionally, how do adaptations in skeletal muscle, such as increased mitochondrial density and oxidative enzyme activity, contribute to improved energy metabolism and exercise performance?