A good HIIT workout can deliver a lot of what you want from traditional cardio — burning fat, elevating your heart rate, pushing you to sweat— in a fraction of the time, making it especially useful for those of us who can't spend all day in the gym. High-intensity interval training (HIIT) has become a familiar workout style. HIIT uses repeated high-intensity exercise bouts interspersed with brief recovery periods to improve endurance and efficiently activate fast-twitch muscle fibres. ~ Berceste