What is HIIT?
High-Intensity Interval Training or HIIT involves bursts of vigorous exercise with short recovery segments. HIIT achieved its buzzworthy status for a number of reasons. One of them being able to squeeze in a highly effective workout even when you’re in a time crunch or have an overwhelming jam-packed schedule. In the 30-minute time frame you’ll be able to break into a sweat, get your heart rate up, push yourself into the anaerobic zone, galvanize your metabolism and stimulate the afterburn effect.
What are HIIT workouts?
The cardio and power exercises are continuously performed non-stop. That kind of training is an interval, due to the rotation of the exercises. Continuous exercising makes it highly intense. Beginners can take a short break between circuits. It should be no more than 10-20 seconds.
The usual training is divided into circuits. For example, 60 seconds of running in place, 60 seconds of squats and 40 seconds of the bar. Workouts consist of 6 – 12 circuits. The lesson lasts for 20-30 minutes (1, 4, 7).
The benefits and advantages of HIIT training
The biggest advantages of high-intensity interval training are working out for shorter bouts while still torching more calories than ever. On top of that you won’t have time to be bored because HIIT usually consists of a variety of exercises which will keep you on your toes. Also, because it lasts no more than 30 minutes, HIIT workouts are suitable for those who do not have much time for physical activity. You’ll get maximum results in minimum time.
During cardio training, only slow muscle fibers are involved, which get the energy from fat cells. But during HIIT training, fast muscle fibers are also used, for which glucose and glycogen are the sources of energy. Due to the fact that the body is constantly switching from fat to glucose and vice versa, metabolism is greatly accelerated, and the muscles become “dry” even faster. Fat cells are also burning at the same time (3, 4).
With this training you can:
- quickly lose weight;
- improve stamina;
- burn about 400 calories in just 30 minutes;
- reduce insulin sensitivity (insulin hypersensitivity is one of the main causes of weight gain and type 2 diabetes);
- burn calories long after the workout is over;
- retain muscle mass while losing fat;
- strengthen the heart muscle and improve the functioning of the cardiovascular system;
- develop strength and endurance at the same time;
- rev up metabolism and boost growth hormone;
HIIT doesn’t require any equipment, so you’ll only need some motivation and self-discipline. Gear up and get it done!
HIIT training is shorter in time than cardio training, and more effective at the same time.
How much HIIT per week to lose weight?
The generalized tips of the average training at HIIT, without taking into consideration specialization (more cardio or more power training) are follows:
Warm-up (duration 5-10 minutes).
HIIT training consists of two components: a high-intensity load and a low-intensity load. These two components interchange among themselves. You can use the same exercise for both circuits. For example, a bike: first you need to pedal with maximum effort (intense phase), then the same thing, but with moderate intensity, reducing resistance to a minimum (low-intensity phase).
Another option: perform a 16 kg kettlebell jerk in the high-intensity phase, and rest in the low-intensity phase; the body changes into a low-intensity phase, trying to catch its breath and restore strength; then a new circuit.
Hitch and stretching (duration 10 minutes).
The total duration of HIIT training is usually from 15 to 30 minutes, excluding warm-up and hitch(5). For the beginners at the HIIT, the duration of the high-intensity interval is 10-15 seconds, low-intensity is 3-5 times longer. As physical fitness improves, the duration of the high-intensity interval may increase, and the low-intensity interval may decrease.
Please, note that the frequency of training at HIIT should not exceed 3-4 times a week. More frequent intensive loads negatively affect both the cardiovascular system and the central nervous system (1, 5). The latter can cause overtraining and general depression!
Examples of the distribution of workouts over time depending on the main goal of the trainee:
Power and mass training.
2-3 times a week, 5 cycles: 10-20 seconds high-intensity phase (exercises with heavy “iron”), 2-3 minutes low-intensity (you can use just brisk walking).
Strength and aerobic endurance training.
3 times a week, 5-8 cycles: 20-30 seconds high-intensity phase (for example, cardio exercise), 45-60 seconds low-intensity (for example, strength exercise).
Fat Burning Workout.
3-4 times a week, 5-8 cycles: 10-30 seconds high-intensity phase, 1-3 minutes low-intensity (a good option – sprinting + jogging).
Training to keep fit.
3 times a week, 4-5 cycles: 10-20 seconds high-intensity phase, 30-40 seconds low-intensity (you can use some kind of plyometric exercise, for example, jumping rope at high and low pace; or strength exercise + cardio exercise).
What to eat before HIIT?
Try to eat healthy light snacks 45-60 min before the training, which includes protein and carbohydrates to have enough energy before the workout (1).
- Almond butter
- Greek yogurt
- Protein shake
30-40 minutes after the training, you can drink a protein shake or whey protein. Then, after 1.5 hours after training, you need to eat fully – meat or fish with vegetables and fruits. All this should be either fresh or steamed (but not fried).
Common mistakes during the training
The prolonged high-intensity phase of the training and, which may cause the loss of intensity. No need to do a high-intensity phase longer than 30 seconds.
Not enough rest between workouts. Some people try to arrange jogging during non-training days, motivating the fact that the fat burning process will go even faster. This is wrong, the muscles and central nervous system will not have time to recover from the previous training, so you can induce overtraining (2, 8).
Absence of warm-up and hitch.
Loads increase too fast. Increase complexity gradually.
Doing workout late in the evening. HIIT morning exercises are more effective in terms of burning calories (4).
Each of us has different goals and opportunities: for some people, there is no need for HIIT (for example, for people who train endurance without regard to the percentage of fat in the body). However for others this training method is absolutely perfect for burning fat (2, 4).
Moreover, if jogging in the fresh air brings psychological pleasure – do not deny yourself the pleasure of running several kilometers, especially in the open air.
But, if the goal is to slim down by burning fat and get in shape in the shortest possible time, then HIIT is one of the most effective ways to achieve it!
This article is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional advice or help and should not be relied on to make decisions of any kind. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Any action you take upon the information presented in this article is strictly at your own risk and responsibility.
- American College of Sports Medicine position stand. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise (2011, ncbi.nlm.nih.gov).
- Comparison of High-Intensity Interval Training and Moderate-to-Vigorous Continuous Training for Cardiometabolic Health and Exercise Enjoyment in Obese Young Women: A Randomized Controlled Trial (2016, ncbi.nlm.nih.gov).
- Dissimilar Physiological and Perceptual Responses Between Sprint Interval Training and High-Intensity Interval Training (2016, ncbi.nlm.nih.gov).
- High intensity interval exercise training in overweight young women (2012, ncbi.nlm.nih.gov)
- High-Intensity Interval Training and Isocaloric Moderate-Intensity Continuous Training Result in Similar Improvements in Body Composition and Fitness in Obese Individuals (2016, ncbi.nlm.nih.gov).
- The acute effect of exercise modality and nutrition manipulations on post-exercise resting energy expenditure and respiratory exchange ratio in women: a randomized trial (2015, ncbi.nlm.nih.gov).
- The effects of short-term high-intensity interval training vs. moderate-intensity continuous training on plasma levels of nesfatin-1 and inflammatory markers (2015, ncbi.nlm.nih.gov).
- Two minutes of sprint-interval exercise elicits 24-hr oxygen consumption similar to that of 30 min of continuous endurance exercise (2012, ncbi.nlm.nih.gov).