Fitness Articles

Burn More Calories in Less Time with HIIT

Make the Most of Every Workout Minute

What if there was a way to burn more calories, lose more fat and improve your cardiovascular fitness level while spending less time doing cardio? If you think this sounds too good to be true, think again. If you want to take your fitness and fat loss to the next level—without spending more time in the gym—it's time to take a look at high-intensity interval training, also known as HIIT.

Notice that I didn’t say HIIT would be easier, just that it would take less of your time. In fact, the HIIT approach to cardio exercise is very physically demanding, and isn’t for everyone. If you have any cardiovascular problems or other health concerns that limit your ability to exercise at very intense levels, or if you're relatively new to aerobic exercise or not already in good shape, you should probably hold off on HIIT—at least for now. If you're not sure whether it's safe for you, check with your medical professional.

What Is High-Intensity Interval Training?

HIIT is a specialized form of training that involves short intervals of maximum intensity exercise separated by longer intervals of low to moderate intensity exercise. To reap the benefits, you need to push yourself past the upper end of your aerobic zone and allow your body to replenish your anaerobic energy system during the recovery intervals. HIIT offers several advantages that traditional steady-state exercise can’t provide:
  • HIIT trains and conditions both your anaerobic and aerobic energy systems. You train your anaerobic system with brief, all-out efforts, like when you have to push to make it up a hill or sprint the last few hundred yards of a distance race.
  • HIIT increases the amount of calories you burn during (and after) your exercise session, because it increases the length of time it takes your body to recover.
  • This type of training causes metabolic adaptations that enable you to use more fat as fuel under a variety of conditions. This will improve your athletic endurance as well as your fat-burning potential.
  • HIIT appears to limit the muscle loss that can occur with weight loss, in comparison to traditional steady-state cardio exercise of longer duration.
The key element that makes HIIT different than other forms of interval training is that the high-intensity intervals involve maximum effort, not simply a higher heart rate. There are many different approaches to HIIT, each involving different numbers of high- and low-intensity intervals, different levels of intensity, different lengths of time for each interval and different numbers of training sessions per week. If you want to use HIIT to improve performance for a particular sport or activity, you can tailor your program to those specific needs and demands.

General HIIT Guidelines

  • HIIT is designed for people whose primary concerns are boosting overall cardiovascular fitness, endurance and fat loss, without losing the muscle mass they already have.
  • Before starting any HIIT program, you should be able to exercise for at least 20 to 30 minutes at 70 to 85 percent of your estimated maximum heart rate, without exhausting yourself or experiencing problems.
  • Familiarize yourself with understanding exercise intensity if you are unable to wear a heart-rate monitor.
  • Because HIIT is physically demanding, it’s important to gradually build up your training program so that you don’t overdo it. The sample training schedule below will safely introduce you to HIIT over a period of eight weeks.
  • Always warm up and cool down for at least five minutes before and after each HIIT session.
  • Work as hard as you can during the high-intensity intervals, until a burning sensation in your muscles indicates that you have entered your anaerobic zone. Elite athletes can usually sustain maximum intensity exercise for three to five minutes before they have to slow down and recover, so don’t expect to work longer than that.
  • Full recovery takes about four minutes for everyone, but you can shorten the recovery times if your high-intensity intervals are also shorter and don’t completely exhaust your anaerobic energy system.
  • If you experience any chest pain or breathing difficulties during your HIIT workout, cool down immediately. (Don't just stop, as this can cause lightheadedness or faintness.)
  • If your heart rate does not drop back down to about 70 percent of your max during recovery intervals, you may need to shorten your work intervals and/or lengthen the recovery spans.
  • HIIT (including the sample program below) is not for beginner exercisers or people with cardiovascular problems or risk factors. If you are in these groups, do NOT attempt HIIT unless your doctor has specifically cleared you for this kind of exercise.

A Sample Progressive HIIT Program

Please adhere to the general HIIT guidelines above for this program. To maximize fat loss, maintain an intensity level of 60 to 70 percent of your maximum heart rate (RPE of five to six on the 10-point scale) during warm up, cool down and recovery intervals.

Week  Warm  up  Work Interval (Max Intensity)  Recovery  Interval
(60-70% MHR)
 Repeat Cool
 Workout  Time
 1  5 min.  1 min.  4 min.  2 times  5 min.  20 min.
 2  5 min.  1 min.  4 min.  3 times  5 min.  25 min.
 3  5 min.  1 min.  4 min.  4 times  5 min.  30 min.
 4  5 min.  1.5 min.  4 min.  2 times  5 min.  21 min.
 5  5 min.  1.5 min.  4 min.  3 times  5 min.  26.5 min.
 6  5 min.  1.5 min.  4 min.  4 times  5 min.  32 min.
 7  5 min.  2 min.  5 min.  3 times  5 min.  31 min.
 8  5 min.  2 min.  5 min.  4 times  5 min.  38 min.

After completing this eight-week program, you can continue increasing the number of work intervals per session, the duration of work intervals or both.

If you find that this schedule is too difficult or too easy, make adjustments to the duration and/or number of high-intensity intervals as necessary. For example, if you want to train for very short, frequent bursts of maximum intensity activity, your program could involve sprinting for 20 seconds and jogging or walking for 60 seconds, and repeating that 15 to 20 times per session.

You don’t need to swap all of your aerobic exercise for HIIT to gain the benefits. A good balance might be two sessions of HIIT per week, along with one to two sessions of steady-state aerobic exercise. As usual, moderation is the key to long-term success, so challenge yourself, but don’t drive yourself into the ground. Get ready to see major changes in your body and your fitness level.

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Member Comments

  • Parents (not televisions) should talk to children during dinnertime.
  • 97MONTY
    great information
  • Don't ever feel bad. It is just part of the process, not a permanent state.
  • Good article. going to put this into effective today
  • I can't do HIIT, but I love Strength Training now and working out with weights. I get just a good a cardio burn hitting the weights versus painfully jumping around.
  • With my joints, I won't be trying this. And if you're on beta-blockers, don't even think about it. Maybe consult your doctor, must if you have any cardio-vascular health conditions, there are safer ways to get fit.
  • This is good for some people, but if someone is on a beta blocker, there is no way they can get to their target heart rate. Beta blockers keep the heart rate depressed, and kicks in whenever the heart rate gets too high. I was on a beta blocker for years, and there was no way I could ever get to my target heart rate. Just had to do the best I could.
  • HITT workouts are true game changers...they amp up one's fitness leve with the killer cardio boosts and truly help melt away me! Most fitness gurus now offer options that are both high or low impact. Leslie Sansone has a HITT walking option, and Jessica Smith offers a playlist that provides options. Incorporating HITT workouts has been one of the best things I have done for me recently! Try one...
    this was super helpful. I think one of the most helpful bits in this article was the advantages Dean made on HIIT. He affirms the benefits of HIIT and makes a convincing argument for the endurance and functional strength you gain by participating in this kind of training. I might even add the indirect argument against long distance cardio is made because you are including anaerobic and aerobic exercise in your workouts.
  • I just started with Hitt a week ago, now I got another routine.
    They just brought in a new sprinting machine at my gym that kicks ass...itís called the HiTrainer. The 3 minute interval protocols are beyond what I've ever done. After 2 weeks of doing it 3 times a week I already feel a big difference. Check out their website to see some videos
  • MARYO125
    HIIT really does WONDERS. I got turned onto this type of workout about two years ago and I feel toner than ever. I use 'HIIT Mix' a coached HIIT music-based workout on my iPod by a company called Motion Traxx. Fitness trainer Jessica Smith talks you through the entire workout, letting you know when to start, stop, keep the pace, and how much longer till the next interval. Itís absolutely amazing and has made HIIT one of my go-to workouts! I recommend to everybody I know: http://motiontrax
    Good article. I like trying HIIT workouts. They are great. Makes you feel like you accomplished something in a little bit of time.

About The Author

Dean Anderson Dean Anderson
Dean Anderson has master's degrees in human services (behavioral psychology/stress management) and liberal studies. His interest in healthy living began at the age of 50 when he confronted his own morbid obesity and health issues. He joined SparkPeople and lost 150 pounds and regained his health. Dean has earned a personal training certification from ACE and received training as a lifestyle and weight management consultant. See all of Dean's articles.

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