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Traditional long distance running can be time consuming and usually doesn’t involve higher intensity sprints. Interval running can help you achieve results while still fitting your lifestyle needs.
Cardiovascular exercise is a vital component of fitness training. Running requires relatively little equipment and can be performed almost anywhere.
Interval running offers a solution for busy individuals who are looking for fitness improvements but don’t have the time for longer runs. It can also be for those who prefer greater intensity in their workouts instead of the typical long, slow jog.
Keep reading for benefits, potential risks, and interval running plans for all levels.
Interval running is a method of structuring your running workouts for increased intensity and greater aerobic improvement with less total time spent per workout.
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Alternatively, you can perform vigorous aerobic activity for at least 25 minutes 3 days per week to meet this recommendation.
SummaryInterval running involves periods of high intensity running alternated with low intensity running, walking, or rest. These cycles allow for greater intensities within the workout while reducing the overall total training time.
The most important factors in designing an interval running plan are:
- time spent in each interval
- number of intervals
- weekly frequency
Each interval period lasts 10–60 seconds at the high intensity pace, followed by 10–60 seconds at the lower intensity pace. In coaches’ terms, these are known as “duty cycles.”
The high intensity pace should be faster than what you could physically sustain for 30 minutes. The lower intensity pace allows you a brief recovery period before the next high intensity pace.
The specific duration of each duty cycle (the ratio of high intensity to low intensity time) will vary based on your specific fitness goals, conditioning level, and time available for working out.
This ratio of high intensity to low intensity is called the work-rest ratio, and it’s a key variable in designing interval running programs. The higher intensity results in greater improvements in your maximum aerobic capacity and works more muscle fibers overall compared to longer, slower jogs.
Overall, the structure of interval running programs allows far more time spent at higher intensities compared to a traditional running program.
Designing the right program will depend on your specific training goals and your baseline fitness level.
Aerobic versus anaerobic training
Interval running allows you to target different energy systems in your body depending on your specific goals.
The main sources of energy used in interval running are the aerobic and anaerobic systems. Both systems always contribute some energy, but the amount of contribution from each depends on the specific interval used.
Aerobic improvements include increased endurance and improved efficiency in the cardiovascular system.
Anaerobic improvements include greater maximal speed, increased muscle growth, and improved maximal power.
You should focus each 4-week workout plan on either aerobic or anaerobic improvements for the duration of the program.
Start with at least one period focused on aerobic improvements to build a strong base. This will prepare your muscles and joints for the intensity of anaerobic training.
General workout structure and tracking improvement
Always warm up with 5–10 minutes of light jogging before an interval training session.
If you’re a beginner, you should start with just a few duty cycles per workout, twice per week. You can then add additional cycles each week as your fitness improves. Avoid doing maximal intensity intervals until you build up a baseline fitness level with aerobic intervals.
Without having to wear a heart rate monitor or perform calculations, the best way to track improvements is by tracking the distance you cover during each high intensity interval. Even a rough estimate from running around a track can show clear signs of improvement.
For a more precise method of tracking progress, you must wear a heart rate monitor or manually take your pulse and compare it with the distance traveled and your perceived exertion.
Tracking your resting heart rate as soon as you wake up in the morning is an easier way to measure cardiovascular improvement for non-athletes targeting aerobic benefits. A lower resting heart rate is a sign that your aerobic system is becoming more efficient.
To avoid overtraining, perform two 20-minute light jogging sessions in the week following your completion of each phase of the program before continuing.
This beginner program is a good place to start your aerobic interval training. After performing your 5-minute light jogging warmup, increase your intensity to roughly 75% of your maximal effort for 30 seconds.
After the intense interval, jog slowly for another 30 seconds and repeat 3 times. Perform this twice per week for 4 weeks.
Add a duty cycle each week. In week 4, you should be performing 6 total intervals per workout, twice per week. Combined with your warmup, the total workout duration should be roughly 11 minutes by week 4.
Beginner interval running workout:
- Complete 5 minutes of a light jogging warmup
- Run 30 seconds at 75% intensity followed by 30 seconds at 25% intensity
- Repeat for 3 cycles on week 1
- Perform the workout twice per week, adding a cycle every week for 4 weeks
Once you’ve performed the 4-week beginner program, you should be ready to add a training session. The intermediate program involves three sessions per week and adds cycles each week.
For this program, you’ll begin by performing 3 cycles, followed by a full 1-minute rest. You will then repeat the cluster 2 more times.
Perform each workout 3 times per week for 4 weeks. Each week, add one more cycle to each cluster.
By week 4, you’ll be performing 3 clusters of 6 intervals. This results in a total of 18 intervals and roughly 25 minutes of total workout time.
Intermediate interval running workout:
- Complete 5 minutes of a light jogging warmup
- Run for 30 seconds at 75% intensity followed by 30 seconds at 25% intensity
- Repeat for 3 cycles followed by a 1-minute rest — this is 1 cluster
- Perform 2 additional clusters per workout in week 1. Over the course of the week, there will be a total of 9 cycles broken into 3 clusters.
- Perform the workout 3 times per week, adding an interval cycle to each cluster per week.
By the time you get through the beginner and intermediate training programs, you will have 8 weeks of interval running training under your belt.
At this point, you can opt to continue to push your aerobic capacity with the advanced aerobic training program, maintain your fitness with the intermediate program, or begin the anaerobic training program.
For the advanced program, you will begin with 3 clusters of 4 cycles using a 30-second interval.
Each week, you will perform an additional cluster per workout. By week 4, you will be performing 6 clusters of 4 cycles for roughly 30 minutes of total workout time, including the warmup.
The overall workout volume will be substantial by the end of week 4.
Advanced interval running workout:
- Complete 5 minutes of a light jogging warmup.
- Run for 30 seconds at 75% intensity followed by 30 seconds at 25% intensity.
- Repeat for 4 cycles followed by a 1-minute rest.
- Perform 3 full clusters in week 1. Week 1 workouts will have a total of 12 cycles broken into 3 clusters.
- Perform the workout 3 times per week, adding a cluster to each workout per week.
Customizing your interval training plan
As mentioned, interval running can be used for both aerobic and anaerobic training.
The interval used in the programs above is a 1-to-1 work-rest ratio and will primarily target the aerobic system. However, you can adapt your program for anaerobic training or a heavier aerobic focus by changing the ratio.
Generally, higher intensities are sustainable for a shorter period and require more rest.
To target anaerobic improvements, a work-rest ratio of 1-to-5 is better than 1-to-1. In this case, an all-out sprint for 10 seconds followed by a 50-second rest would target anaerobic improvements.
Keep in mind that aerobic and anaerobic training is a spectrum rather than a hard-and-fast number cutoff. Every activity involves some contribution from both systems, with each playing a greater role depending on the interval.
The shorter the work interval and the longer the rest, the more your body will rely on anaerobic energy, provided you’re proportionally increasing the intensity.
With this in mind, it’s best to stick with one work-rest ratio for a 4-week duration to optimize the specific adaptation.
SummaryInterval running should be performed as part of a structured workout. Begin with just a few aerobic intervals before progressing to more intense anaerobic training or a high number of interval cycles.
Interval running offers many benefits. These include the standard benefits of aerobic exercise, such as a lower heart rate and reduced blood pressure levels.
However, interval running also results in additional adaptations due to the intensity level you reach during the hard intervals.
According to
- improved capacity to utilize oxygen
- improved blood glucose levels
- decreased blood pressure
- decreased risk factors for cardiovascular disease
These benefits are similar to those associated with traditional longer duration running at slower paces.
Interval running offers additional benefits over traditional running, such as reduced workout durations for similar results and increased insulin sensitivity.
Calories burned from interval running
The number of calories you burn in an interval running session depends upon many factors, including your current weight and fitness level, the intensity of each work interval, and the total number of intervals used.
A 20-minute session of aerobic exercise like interval running burns anywhere from 150–400 calories.
However,
When combined with a proper nutrition plan, interval running is a good way to support weight loss programs.
SummaryInterval running offers many health and performance benefits, such as decreased blood pressure and a improved blood glucose levels. It also burns calories during and after the workout.
Overall, interval running is a safe way to improve cardiovascular health via shorter duration workouts.
Nevertheless, there are a few potential risks with interval running. These largely stem from the increased intensity and impact that occurs during the faster-paced intervals.
The impact on the ankles, knees, and hips is greater during faster running.
You’ll probably feel especially sore after your first couple of interval workouts. While muscles can adapt fairly rapidly, it takes more time for your joints and bones to adapt to this stress.
To mitigate the potential for injury, start slowly when you begin interval running. If you’re new to running altogether, do 10-minute jogs with a brief sprint at the end twice a week for 4 weeks to begin adapting to running.
If you have experience running, but not with intervals, start with the beginner program and consider doing a single cluster for the first few weeks. Make sure there are at least 2 full days between sessions.
Your body will adapt better to the stress if you don’t overload it too quickly and ensure adequate recovery.
If you have not exercised in a long time, a brisk walk may be enough intensity for the high intensity interval, and a slow walk for the low intensity interval. You can then work your way up to running.
If possible, you should avoid hard surfaces like concrete or asphalt to reduce the impact. Rubberized track, grass, or other softer surfaces are your best bet for interval running.
Finally, always take an active rest week in between 4-week sessions. A few brief jogs or walks will maintain your fitness while allowing your body to recover for the next phase of training.
SummaryTo avoid risks of injury or overtraining, add intervals slowly and take active rest weeks between each 4-week program.
The simplest way to time your intervals is with a standard stopwatch.
However, due to the intensity of interval running, it may be challenging to track your intervals manually.
As such, it may be helpful to have an interval timer app that tells you when to rest and when to go.
The following are just a few apps that offer interval timing:
Interval running is an efficient and effective way to improve your aerobic and anaerobic fitness, as well as your cardiovascular health.
Generally, interval workouts require less total time than traditional distance running and allow greater intensities during the workout itself.
Depending on your goals, you can adjust your intervals to target different energy systems in your body.
The most important thing is to start slow and ease into interval training, particularly if you’re newer to running.
If you’re looking for a method of adding intense aerobic and anaerobic exercise without long traditional workouts, interval running offers an excellent solution.
