High-Intensity Interval Training (HIIT) is a workout method involving short bursts of intense exercise alternated with periods of rest or lower-intensity activity. HIIT optimizes fat loss by significantly increasing the metabolic rate during and after workouts, a phenomenon known as excess post-exercise oxygen consumption (EPOC). This training style can burn more calories in less time compared to traditional steady-state cardio. Additionally, HIIT can improve cardiovascular fitness and endurance, making it an efficient and effective option for those aiming to lose fat and enhance overall fitness.