HIIT or high-intensity interval training is a training technique that requires you to perform quick intense bursts of exercise followed by short and active recovery periods. This type of training gets and keeps your heart rate up and burns greater fat in less time. A high-intensity workout increases the body’s need for oxygen during the effort and creates a shortage thus causing your body to ask for more oxygen during recovery. This afterburn is the reason why HIIT helps burn more fat and calories than regular aerobic and steady-state workouts. But is this fitness fad doing more harm than good