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Serious athletes have long known about the benefits of high intensity interval training (HIIT)—alternating periods of short, intense anaerobic exercise with less intense recovery periods—and they’ve been reaping the rewards, too.
HIIT: WHAT IS IT 
?
HIIT, or high-intensity interval training, is a training technique in which you give all-out, one hundred percent effort through quick, intense bursts of exercise, followed by short, sometimes active, recovery periods. This type of training gets and keeps your heart rate up and burns more fat in less time.
What is high intensity cardio?
High Intensity Interval Training involves alternating between very intense bouts of exercise and low intensity exercise. For example, sprinting for 30 seconds, then walking for 60 seconds is high intensity interval training. HIIT can be used both anaerobically (in the gym with weights) and aerobically with cardio
HIIT is all the hype lately. According to a survey conducted by The American College of Sports Medicine, it’s one of the two top fitness trends for 2014 (the other being bodyweight training). So what’s this type of training all about? What is it with HIIT?
HIIT, or high-intensity interval training, is a training technique in which you give all-out, one hundred percent effort through quick, intense bursts of exercise, followed by short, sometimes active, recovery periods. This type of training gets and keeps your heart rate up and burns more fat in less time. “A high-intensity workout increases the body’s need for oxygen during the effort and creates an oxygen shortage, causing your body to ask for more oxygen during recovery,” says Eric Salvador, NASM, NSCA, head instructor at The Fhitting Room in New York City. “This afterburn effect is referred to as Excess Post-Exercise Oxygen Consumption (EPOC) and is the reason why intense exercise will help burn more fat and calories than regular aerobic and steady-state workouts.”
