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Maybe you haven't set foot inside a gym in months, and you shudder at the thought of running on a treadmill or lifting weights. Or maybe you're a seasoned gym-goer who's hit a plateau in your progress. No matter your fitness persona, there's one thing we all have in common: When we're ready to get in shape, we want it to happen quickly. Overnight would be nice, but we're not the Hulk, so we've got to get real. And the best way to do that is to rely on science (because busting our humps at the gym is a wash unless we're doing it correctly).
What Is High Interval Intensity Training (HIIT)?
High Internal Intensity Training (HIIT) is a workout comprised of short bursts of intense cardiovascular exercise alternated with less intense recovery periods. HIIT offers impressive health benefits, such as burning a high amount of calories in a short amount of time, losing fat, and increasing metabolic activity.
First, let's define what we mean by "getting in shape." We're classifying this as increased muscle definition and general physical performance, aka, having a more toned physique and being able to climb the stairs at work without gasping for air. So how can you do this in the shortest amount of time? Studies suggest that swapping out endurance workouts for HIIT yields the same cardiovascular and muscular benefits in half to one-third the time.
Studies and Results
In one particular study, 27 subjects were split into two groups—endurance training and HIIT—and took part in their separate training regimens for a series of weeks. At the end of the study, the HIIT group lost three times as much body fat as the endurance training group, even though they burned almost half as many calories (which goes to show that the calorie counter on your treadmill shouldn't be your measure of success).
Busybodies, rejoice: One hour of high-intensity exercise over the course of a week will lead to greater fat-melting results than 150 weekly minutes of moderate-intensity activity. So while you'll have to push yourself harder for those short intervals, you won't have to work out as long.
But before you lace up your sneakers and head for the treadmill, know this: Yes, running at sprint and recovery intervals will help you burn more fat than you would with a steady jog, but Jessica Matthews, an exercise physiologist with the American Council on Exercise, says you'll reap the most benefits of HIIT from full-body exercises like burpees, kettlebell swings, plank-ups, etc., which we've outlined for you below.
Ready to lose more fat in less time? Here are some of the best fat-blasting HIIT workouts.
For Your Buns
For Your Abs
For Your Legs
For Your Upper Body
Before beginning a fitness regimen, please consult with your doctor first.