High-intensity interval training (HIIT) describes any workout that alternates between intense bursts of activity and fixed periods of less-intense activity or even complete rest.
HIIT will mean you have to 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. This after burn 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.
EPOC, the the scientific term for the after burn effect, can help you burn more calories long after you’ve left the gym.
When a person works out at an intensity they can’t sustain for a long period of time, two things happen: their muscles begin to burn and they start feeling out of breath. Why? Upon exertion, muscles start to fill up with lactic acid (the chemical responsible for that burning feeling) and the body’s oxygen stores become depleted.
Studies show strenuous resistance exercise results in greater post-exercise oxygen consumption compared to steady-state endurance exercise that burns the same number of calories. So while you might burn