High-Intensity Interval Training, or HIIT, involves alternating short bursts of intense activity with periods of rest or lower-intensity exercise. This format offers several benefits including increased caloric burn, improved cardiovascular health, and enhanced metabolic rate. HIIT workouts are time-efficient and can be adapted to fit various fitness levels. They also promote improved endurance and can lead to greater fitness gains compared to steady-state cardio. Overall, HIIT can be an effective way to maximize results in a shorter workout time.