High-intensity interval training (HIIT) benefits cardiovascular health by effectively improving heart function and aerobic capacity in a shorter duration compared to traditional workouts. HIIT alternates between short bursts of intense exercise and recovery periods, elevating the heart rate and boosting metabolism. This training method can improve insulin sensitivity and promote weight loss, reducing the risk of cardiovascular diseases. Moreover, HIIT enhances cardiovascular efficiency and endurance, making it a time-efficient option for improving overall heart health.