The primary function of the cardiovascular system in relation to exercise is to transport oxygen and nutrients to the muscles while removing metabolic waste products. During physical activity, the heart rate increases to pump more blood, delivering necessary energy and sustaining performance. A well-conditioned cardiovascular system enhances endurance, enabling individuals to perform longer and at higher intensities. It also plays a crucial role in regulating body temperature and distributing hormones essential for energy production. Overall, a healthy cardiovascular system is vital for maximizing exercise effectiveness and supporting overall health.