Every cyclist, from the weekend warrior to the pro cyclists, can attest to the relentless pursuit of increased power output, speed, endurance, VO2 max, lactate threshold, and cycling performance.
Interval sessions are proven cycling workouts that can turbocharge your rides and bring about impressive gains in power output and efficiency.
The promise lies in its structured approach, which alternates between periods of intense effort, valuable training time, and recovery time.
This intense workout maximizes your training time, as it's time-efficient, providing the best bang for your buck and pushing your body to adapt and overcome increasingly challenging stimuli.
In this interval training guide, we'll provide practical advice on incorporating it into your training plan, optimal timing for sessions, and share the best 5 interval workout examples.
Cycling Interval Training Fundamentals
What is interval training?
Interval training (a.k.a HIIT or high intensity interval training) is a structured approach that alternates between periods of high effort and controlled recovery time.
During high intensity intervals, cyclists are expected to work at their maximum capacity, which directly contributes to increasing their VO2 max, — the same adaptation driven by altitude training — followed by lower-intensity intervals (Zone 1 / Zone 2), allowing partial recovery.
The effectiveness of this intense workout lies in its ability to increase the body's metabolic rate, not just during the workout training time, but also for hours after completing the exercise, a phenomenon known as excess post-exercise oxygen consumption (EPOC).
This leads to improved cardiovascular health, cycling performance, and greater calorie burn.
To put these sessions into a structured week, see our cycling for weight loss plan — it combines Zone 2 base rides with progressive HIIT for consistent fat loss.
Is interval training necessary for cyclists?
By incorporating these HIIT efforts into your cycling training plan, you can stimulate physiological adaptations, including an increase in VO2 max, which translates into more robust performance.
The strategic insertion of these interval workouts into your plan is akin to fine-tuning an engine.
You need a broad range of energy systems to respond to the dynamic demands of racing or rigorous riding.
Interval training hones these systems, ensuring that you can sprint, climb, and endure longer distances with greater ease.
Interval training instills a sense of discipline and mental toughness as you learn to push through the discomfort of high-intensity peaks, which in turn can significantly enhance your VO2 max.
When and how often should you do it?
It's essential to strike a balance between physiological adaptation and adequate recovery after cycling periods.
As a rule of thumb, integrating one to three interval sessions per week into your cycling training plan is a solid starting point.
These should be interspersed with Zone 2 rides or rest days to facilitate recovery and prevent overtraining.
The timing of interval sessions within your overall training plan is also critical.
They should ideally be scheduled during periods when you're looking to peak your performance – for example, in the weeks leading up to a race.
However, during off-season or base-building phases, interval workouts can be used less frequently to maintain fitness without the stress of high training volume.
Listen to your body; if you find yourself struggling to recover or if performance begins to decline, it may be a sign to scale back and allow for more recovery time.
How long should intervals be?
The interval duration should align with your specific training goals and current fitness level.
Short intervals, typically ranging from 30 seconds to 2 minutes, are effective for enhancing anaerobic capacity, working your fast twitch fibers and increase power output, making them ideal for short sprints.
For these short intervals, rest intervals should be twice the length of the work phase to maintain quality and intensity throughout the session.
If your focus is on building endurance and aerobic capacity, consider longer intervals lasting between 3 to 10 minutes.
These intervals are performed at a moderate to high intensity and are beneficial for improving your ability to sustain a higher pace over extended periods.
Recovery periods for longer intervals should be shorter, typically equal to or slightly less than the work phase, to simulate race conditions and enhance endurance.
It's crucial to tailor the length of your interval workouts based on your objectives and how your body responds to different intensities.
As your fitness improves, you can gradually increase the length of your intervals or intensify them to challenge your body further.
Which interval types should you do?
When determining which interval types to incorporate, consider the current phase of your training plan.
If you are in the base phase, focus on building a strong aerobic foundation with longer, moderate-intensity intervals.
These sessions should prioritize endurance and help you develop the stamina needed for more intense phases later on.
During the build phase, shift your focus to more specific intervals that align with your target event.
If you are preparing for a race that requires explosive short efforts, include short, high-intensity intervals to enhance your anaerobic capacity and sprinting power.
For events that demand sustained effort, longer intervals at a high intensity will be more beneficial, as they mimic race conditions and improve your ability to maintain speed over time.
In the specialty phase, fine-tune your intervals to match the demands of your upcoming event.
The specificity of your intervals should reflect the unique challenges of your target event, ensuring you are well-prepared and confident on race day.
Which cyclists should include interval workouts?
This potent training technique is not reserved for the elite or those with years of experience in the saddle.
Beginners can use interval sessions to build a strong aerobic base and to improve their aerobic fitness quickly.
Meanwhile, more seasoned riders may focus on refining their performance and endurance for competition.
For the competitive cyclist, interval workouts are indispensable.
It simulates the unpredictable nature of race conditions, where rapid accelerations and strategic positioning demand short, intense bursts of energy.
However, even recreational cyclists looking to improve their health, fitness, and VO2 max can integrate it into their training plan.
When to stop an interval session
Executing an interval training session with precision is crucial for maximizing its benefits.
You should aim to maintain the intended intensity throughout each interval to ensure that your cardiovascular and muscular systems are adequately challenged.
This requires a focused effort and attention to maintaining proper form and pacing.
Completing an interval session should leave you feeling fatigued but not completely exhausted.
You should experience a sense of accomplishment and know you've pushed your limits without overextending yourself.
It's important to finish the session with enough energy to recover effectively and prevent burnout.
There are specific indicators that signal when it's best to cut an interval session short.
If you notice a significant drop in power output or an inability to maintain the target intensity, it may be time to stop.
This decline can indicate that your body is approaching a state of overreaching, which can lead to decreased performance and increased risk of injury.
Listening to your body and recognizing these signs ensures that you train effectively while minimizing the risk of overtraining.
Ultimately, the goal is to conclude your interval training feeling challenged yet capable of recovery.
When to skip an interval workout
Adequate rest before an interval training session is crucial for maximizing its effectiveness.
Starting a session without proper rest can lead to suboptimal performance, as your muscles and cardiovascular system may not be fully recovered from previous workouts.
Ensuring you are fully recovered from previous sessions allows you to hit the target intensities and maintain the quality of each interval, which is essential for achieving the desired training adaptations.
Engaging in interval training without sufficient rest can be counterproductive.
Fatigue can impair your ability to sustain the necessary intensity, reducing the effectiveness of the workout and increasing the risk of injury.
Over time, consistently training in a fatigued state can lead to overtraining syndrome, characterized by decreased performance, increased susceptibility to illness, and prolonged recovery periods.
Prioritizing rest between sessions helps prevent these negative outcomes and supports long-term progress.
There are specific circumstances when it's best to skip an interval training session.
If you are experiencing signs of overtraining, such as persistent fatigue, mood disturbances, or a plateau in performance, it may be wise to rest instead.
Additionally, if you have not fully recovered from a recent illness or injury, or if you are feeling unusually tired or stressed, it's advisable to postpone the session.
Benefits of Interval Training for Cyclists
Increased VO2 max
When you engage in interval training, one of the primary benefits is the increase in your VO2 max.
This metric represents the maximum amount of oxygen your body can utilize during intense exercise.
By enhancing VO2 max, you improve your cardiovascular efficiency, allowing your heart and lungs to deliver oxygen more effectively to your muscles.
This improvement is crucial for endurance performance, as it enables you to sustain higher intensities for longer periods.
Interval training pushes you to work at a high intensity for short bursts, followed by periods of rest or lower intensity.
This approach challenges your cardiovascular system, promoting adaptations that increase your VO2 max.
The repeated exposure to high-intensity efforts stimulates your body to enhance its oxygen uptake and delivery capabilities.
As a result, your overall aerobic capacity improves, which is beneficial not only for cycling but for any endurance sport.
By increasing your VO2 max, you become more efficient at using oxygen, which translates to less fatigue during long rides.
Improve Anaerobic Threshold
Pushing your limits during interval training sessions can lead to significant improvements in your anaerobic threshold.
This threshold is the point at which your muscles start to produce lactic acid faster than it can be cleared, resulting in fatigue.
By regularly exceeding this threshold in controlled intervals, you train your body to tolerate higher levels of lactic acid, delaying the onset of fatigue.
As your anaerobic threshold improves, you can maintain higher intensities for longer durations without feeling exhausted.
This adaptation occurs because your muscles become more efficient at processing lactic acid, and your body enhances its ability to buffer and clear it.
Consequently, you can sustain a faster pace during rides and recover more quickly from intense efforts.
Improving your anaerobic threshold also leads to better overall performance in cycling.
Increased Fat Utilization
Interval training enhances your body's ability to utilize fat as a fuel source during exercise.
By engaging in high-intensity efforts followed by periods of rest, you stimulate specific adaptations in your muscles.
These adaptations increase the number and efficiency of mitochondria, the powerhouses of your cells, which are crucial for fat oxidation.
As a result, your muscles become more adept at breaking down fat for energy, especially during prolonged activities.
This improved fat utilization allows you to spare glycogen stores, delaying fatigue and extending your endurance.
As your body becomes more efficient at using fat, you can maintain energy levels for longer periods without relying heavily on carbohydrates.
This shift in energy utilization is particularly beneficial during long rides or endurance events, where sustaining energy is critical.
Furthermore, increased fat utilization contributes to better body composition and weight management.
By burning more fat during exercise, you can improve your overall metabolic rate and enhance your fitness levels.
Improved Muscle Endurance
Through interval training, your muscles undergo specific adaptations that enhance their endurance.
This type of training increases the density of capillaries in your muscle tissue, which improves blood flow and oxygen delivery.
As a result, your muscles can sustain activity for longer periods without experiencing fatigue.
Additionally, interval training stimulates the production of mitochondria within your muscle cells.
Mitochondria are responsible for converting nutrients into energy, and having more of them means your muscles can produce energy more efficiently.
This increased energy production capacity allows you to maintain a higher intensity during longer rides.
Furthermore, interval training enhances the efficiency of your muscle fibers.
By regularly pushing your muscles to their limits, you promote the development of more fatigue-resistant muscle fibers.
Improve Your Mental Toughness
Interval training plays a crucial role in building your mental toughness by exposing you to repeated bouts of hard efforts.
This repeated exposure teaches you to manage discomfort and stay focused under stress, which is essential for mental resilience.
By consistently pushing your limits, you develop the ability to stay calm and composed in challenging situations.
Facing intense intervals requires you to tap into your mental reserves, encouraging you to push through fatigue and overcome self-doubt.
Each session tests your willpower, gradually strengthening your mental fortitude.
As you progress, you become more adept at setting and achieving goals, which boosts your confidence and determination.
Additionally, interval training enhances your ability to concentrate and maintain motivation during prolonged efforts.
By training your mind to handle short bursts of intense activity, you improve your capacity to stay engaged and committed during long rides or races.
How to Measure Interval Training
Intervals with a Power Meter
Using a power meter for interval training provides precise data on your performance.
It allows you to measure power output in watts, offering an accurate assessment of your effort level and training zones.
This method helps you track improvements over time and tailor interval workouts to specific goals.
However, power meters can be expensive and require regular calibration to ensure accuracy.
When using a power meter, it's crucial to understand your functional threshold power (FTP).
This will help you set appropriate interval targets.
Regularly updating your FTP ensures your training remains effective.
Be aware that external factors like fatigue and nutrition can affect power output, so consider these when analyzing data.
Ensure your power meter is compatible with your bike and training software.
This compatibility facilitates seamless data integration and analysis.
Familiarize yourself with the device's features and limitations to maximize its benefits.
Consistent use and data review will enhance your training effectiveness and help you achieve your cycling goals.
Intervals with Heart Rate Monitor
Monitoring your intervals sessions with a heart rate monitor offers a cost-effective way to gauge your effort.
This method provides insight into your cardiovascular response to exercise, helping you understand how your body adapts to training.
However, heart rate can be influenced by factors like hydration, stress, and temperature, which might affect accuracy.
Ensure your heart rate monitor is properly fitted to avoid data discrepancies.
It's crucial to know your maximum heart rate and establish training zones based on it.
This helps you maintain the correct intensity during intervals.
Regularly update your training zones as your fitness improves.
Be mindful that heart rate lag can occur, meaning your heart rate may not immediately reflect changes in intensity.
To maximize effectiveness, use heart rate data alongside other metrics like perceived exertion or power output, if available.
This comprehensive approach will provide a well-rounded understanding of your performance and progress.
Intervals with RPE
RPE, or Rate of Perceived Exertion, offers a subjective yet valuable measure of your effort during cycling intervals.
This method doesn't require any equipment, making it accessible and easy to implement.
You rely on your internal assessment of how hard you feel you're working, which can be beneficial in situations where technology fails or is unavailable.
However, this approach lacks the precision of power meters or heart rate monitors and can be influenced by personal bias and external conditions.
When using RPE, it's important to develop a consistent scale that works for you, typically ranging from 1 to 10.
Regular practice will help you align your perceived effort with actual performance.
Be aware of factors like fatigue, stress, and environmental conditions that can alter your perception.
Combining RPE with objective data, when possible, can provide a more comprehensive view of your training efforts and progress.
Interval Training Indoor vs Outdoor
Indoor Interval Training
Indoor interval training offers several advantages.
You can control your environment, ensuring consistent conditions that allow you to focus solely on your workout.
This method provides precise control over resistance and intensity, enabling you to target specific power zones effectively.
Additionally, it eliminates variables such as weather or traffic, which can disrupt outdoor sessions.
You can also easily track your performance metrics in real-time, allowing for immediate adjustments to your training plan.
However, training with an indoor trainer has its drawbacks.
The lack of outdoor scenery can lead to monotony, making it challenging to maintain motivation over extended periods.
Furthermore, the absence of natural airflow may lead to overheating, requiring you to take additional measures to manage temperature and hydration.
When using an indoor trainer, consider several key factors.
Ensure your equipment is properly set up to prevent injury and maximize comfort.
Use a fan to simulate airflow and maintain a comfortable temperature.
Incorporate a variety of workouts to prevent boredom and ensure a well-rounded fitness regimen.
Pay close attention to hydration and nutrition, as indoor sessions can lead to increased sweat loss.
Finally, regularly assess your performance data to adjust your training intensity and duration appropriately, ensuring continued progress and adaptation.
Outdoor Interval Training
Outdoor interval training brings unique benefits that enhance your overall cycling experience.
By engaging in this method, you expose yourself to varying terrain and real-world conditions, which can improve your bike handling skills and adaptability.
Outdoor training allows you to practice pacing and effort management in a dynamic environment, which is crucial for real-world cycling events.
However, this method also presents challenges.
Weather conditions can be unpredictable, potentially disrupting your planned sessions or affecting your performance.
Traffic and road conditions can pose safety risks, requiring heightened awareness and sometimes altering your route.
The lack of precise control over resistance and consistent intervals may make it difficult to target specific power zones as effectively as indoor training.
When training outdoors, consider several important factors to maximize your sessions.
Plan your routes in advance to ensure they align with your interval goals and provide safe conditions.
Pay attention to weather forecasts and dress appropriately to maintain comfort and performance.
Finally, maintain an awareness of your surroundings to ensure safety while still focusing on your interval objectives.
The 5 Best Cycling HIIT Workouts
To translate theory into practice, let's explore some practical intensity interval training HIIT examples.
Always remember to prepare your body for the interval workout ahead with a gentle warm up, and finish your interval session with an easy pace cool-down recovery.
VO2Max Intervals
These intervals are designed to significantly challenge your aerobic ceiling by maintaining efforts at or above your VO2Max intensity.
This session pushes your oxygen uptake capacity and improves your high-end aerobic power.
If you want to improve your VO2Max, you can follow our dedicated VO2Max cycling training plan.
Sweet Spot Intervals
Sweet Spot training targets the range just below your functional threshold, typically between 88–94% of FTP.
It delivers a strong aerobic stimulus while allowing you to recover more quickly than full threshold efforts.
It improves your FTP, muscular endurance, and metabolic efficiency.
Billat Intervals
Billat intervals are based on training at VO2Max power but breaking it into repeated on/off efforts.
This maximizes time spent at VO2Max intensity with less fatigue.
Tabata Intervals
The Tabata is intervals with 20 seconds of all out sprints at max power output followed by 10 seconds of recovery.
This workout targets improving sprinting ability and explosive power.
Pyramid Intervals
Alternatively, "pyramid" sessions, where interval lengths and intensities increase then decrease.
e.g.,1-2-3-4-3-2-1 minutes with half time recovery periods provide a challenging and varied workout that engages multiple energy systems.
Over Under Intervals
"Over-unders" are intervals where you alternate just above and just below your functional threshold power (FTP).
2 x 20 or Steadystate Interval Workout
The "2x20" workout consists of two 20-minute intervals at a high but sustainable intensity, separated by a 10-minute easy spinning recovery.
This workout targets improvements in endurance and lactate threshold.
Wrap-Up
In closing, intervals stands as a pivotal element in a cyclist's training arsenal.
Whether you're a beginner seeking to build a strong fitness foundation or a seasoned competitor aiming to fine-tune your performance, interval training is adaptable to your needs and goal event.
By incorporating a variety of interval workouts you can target specific energy systems and provoke the desired physiological adaptations.
Remember to integrate intervals thoughtfully into your regimen, starting with one to two sessions per week and paying close attention to your body's response, ensuring adequate recovery and rest periods to avoid overtraining.
With consistency and a well-structured approach, interval training can elevate your cycling capabilities to new heights, rendering you a more powerful, efficient, and resilient rider.