High-Intensity Interval Training (HIIT) positively impacts cardiovascular health by improving heart efficiency and increasing VO2 max, which signifies the maximum oxygen uptake during exercise. By alternating short bursts of intense activity with periods of rest, HIIT promotes better blood circulation and enhances metabolic rate. This training style can lower blood pressure and improve cholesterol levels, contributing to overall heart health. Additionally, HIIT is time-efficient, enabling individuals to achieve significant cardiovascular benefits in a shorter workout duration compared to traditional exercise methods.