These benefits of HIIT will convince you to make the workout a part of your regular routine.

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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.

For example, a good starter workout is running as fast as you can for 1 minute and then walking for 2 minutes. Repeat that 3-minute interval five times for a 15-minute, fat-burning workout. It sounds too simple to be effective, but science suggests the workout style is worthwhile. Read on for eight proven benefits of HIIT.

It's Efficient

HIIT workout
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HIIT is the ideal workout for a busy schedule–whether you want to squeeze in a workout during your lunch break or to get in shape for a fast-approaching event. Research shows you can achieve more progress in a mere 15 minutes of interval training (done three times a week) than the person jogging on the treadmill for an hour. And according to a 2011 study presented at the American College of Sports Medicine Annual Meeting, just two weeks of high-intensity intervals improves your aerobic capacity as much as six to eight weeks of endurance training.

Even if you only have four minutes to spare, you can fit in an effective HIIT workout with the Tabata training method. Tabata is a style of HIIT that calls for 2o seconds of work followed by 10 seconds of rest, repeated 8-20 times total. Start with one of these unbelievably quick workouts to start seeing the benefits of HIIT.

Quick Tabata Workouts

You'll Burn More Fat

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Not only do you burn more calories during a HIIT workout than steady-state cardio, but the effect of all that intense exertion kicks your body's repair cycle into hyperdrive. That means you burn more fat and calories in the 24 hours after a HIIT workout than you do after, say, a steady-pace run. So if you're looking to get out of a morning jog with your roommate, just tell them all about this benefit of HIIT. (Here's all the science on exactly how to build muscle and burn fat.)

You'll Build a Healthier Heart

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Most people aren't used to pushing into the anaerobic zone (that lovely place where you can't breathe and you feel like your heart is trying to jump out of your chest). But in this case, extreme training produces extreme results. One 2006 study found that after eight weeks of doing HIIT workouts, subjects could bicycle twice as long as they could before the study, while maintaining the same pace.

There's No Equipment Necessary

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Running, biking, jump roping, and rowing all work great for HIIT, but you don't need any equipment to get it done. High knees, fast feet, or anything plyometric like jumping lunges work just as well to get your heart rate up fast and reap the benefits of HIIT. In fact, some equipment like dumbbells can make HIIT less effective because you want the focus to be on pushing your heart to its max, not your biceps. Here are a few no-equipment workouts to get you started.

No-Equipment HIIT Workouts

It Promotes Weight Loss without Muscle

HIIT workout
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When you're on a diet, it's hard to not lose muscle mass along with fat. While steady-state cardio seems to encourage muscle loss, studies show that both weight training and HIIT workouts allow dieters to preserve their hard-earned muscles while ensuring most of the weight lost comes from fat stores. Win/win!

You'll Increase Your Metabolism

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In addition to increased fat burning and more muscle preserved, HIIT stimulates the production of your human growth hormone (HGH) by up to 450 percent during the 24 hours after you finish your workout. HGH is not only responsible for increased caloric burn, but it also slows down the aging process—one of the sneaky benefits of HIIT workouts. (More here: The #1 Anti-Aging Workout, According to Research)

You Can Do It Anywhere

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You can do it in a boat, you can do it with a goat. You can do it here or there, you can do it anywhere! Dr. Seuss would have loved HIIT. Since it's such a broad concept—go at maximum effort for a short period of time followed by a recovery period and repeat—you can modify it based on the time and space constraints you have and still get the benefits of HIIT. These workouts prove just how adaptable HIIT cardio is.

Do-Anywhere HIIT Workouts

It's Seriously Challenging

HIIT workout
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This is not a workout you can do while reading a magazine or chatting with your friend. Because it's so short, you'll be working hard the whole time. The trade-off is this format offers seasoned exercisers a new challenge and new exercisers a quick way to see results—a benefit of HIIT that other workouts just don't offer. HIIT high-intensity intervals may have you sucking wind, but you definitely won't be bored .