High-intensity interval training (HIIT) positively impacts cardiovascular health by improving heart function and increasing aerobic capacity. HIIT involves alternating between short bursts of intense exercise and periods of rest or lower-intensity activity. This approach has been shown to enhance heart rate variability, lower blood pressure, and improve cholesterol levels, thus reducing cardiovascular disease risk. The efficiency of HIIT allows individuals to achieve significant health benefits in a shorter duration compared to traditional steady-state workouts. Moreover, HIIT can elevate metabolism post-exercise, leading to improved weight control and overall health outcomes.