High-Intensity Interval Training (HIIT) is a workout strategy that alternates between short bursts of intense activity and brief recovery periods. In a typical HIIT session, participants engage in activities like sprinting, jumping, or cycling at full intensity for 20-30 seconds, followed by a rest or low-intensity period. This cycle is repeated several times, allowing for maximum calorie burning. Due to its intensity, HIIT is ideal for those with a busy schedule who still want to achieve maximum results in a shorter amount of time.