Elevation gain: what it is and how to train for it in trail running

By JuanPa, creator of TrainingForever · With the experience of Marc Bañuls, coach with more than 15 years of experience · Updated 19/10/2026

Rapid response: the accumulated slope is the sum of all the meters that you climb in a path (positive slope, D+) or that decrease (negative slope, D-). It is not the difference between the highest and lowest point: if you climb 300 m, go down 200 m and climb back up 300 m, the D+ is 600 m. To compare runs the ITRA uses km-effort: kilometres + D+ in meters ÷ 100.

Introduction to the management of the cumulative gap

Trail running is a discipline that challenges both the physical and mental endurance of the runners, taking them across varied and often rugged terrain. One of the most distinctive features of this sport is the accumulated unevenness, a factor that can significantly influence the performance and experience of the rider. In this section, we will explore what is the accumulated slope and why it is crucial to manage it properly in the context of trail running.

Definition of cumulative difference

The accumulated slope is the sum of all the meters you go up (accumulated positive altitude, D+) and, separately, that of all the meters you go down (accumulated negative altitude, D-) during a race or a training session. They are two different figures, not a sum of both. Unlike running on flat surfaces, where effort is relatively constant, trail running involves adapting to continuous changes in altitude. This concept is fundamental to understanding the total effort required on a specific route.

To calculate the accumulated slope, each segment of ascent and descent along the route is considered. For example, if a runner climbs 200 meters, descends 150 meters, and then climbs another 100 meters, the positive accumulated elevation would be 300 meters (200 + 100), while the negative accumulated elevation would be 150 meters. They are expressed separately (D+300 m, D-150 m); the ITRA uses the D+ to calculate the km-effort.

Importance in trail running

Effective management of the accumulated unevenness is essential for success in trail running for several reasons:

1. Impact on physical endurance: Running on land with significant unevenness requires additional physical effort. Ascents demand greater muscle and cardiovascular power, while declines, although they may seem easier, require control and technique to avoid injuries. Therefore, training with a focus on accumulated unevenness helps to improve resilience and resilience.
2. Race strategy: Knowing the accumulated unevenness of a route allows runners to plan their pace and race strategy. For example, in a race with a pronounced initial ascent, a racer may choose to conserve energy at first to better meet subsequent challenges. The anticipation of these changes on the ground is key to optimizing performance.
3. Injury prevention: Sudden changes in elevation may increase the risk of injury, especially to the knees and ankles. By effectively managing the accumulated unevenness, runners can adapt their technique and pace to minimize the impact on their joints, thus reducing the risk of long-term injury.
4. Adaptation to the environment: Each trail running route is unique, and the accumulated unevenness can vary dramatically from place to place. Runners that train regularly on varied terrain develop better adaptation to different types of terrain and climatic conditions, allowing them to compete in a wide range of environments.
5. Improved mental performance: Coping with and overcoming the challenges of cumulative unevenness also has psychological benefits. The ability to manage the mental effort needed to cope with prolonged ascents and descents strengthens mental resilience, a crucial component for success in long-distance races.

Methods of calculation of the accumulated level

The calculation of accumulated unevenness is an essential part of the planning and management of trail running training. Understanding and applying precise methods to measure the accumulated unevenness can make a significant difference in the performance and safety of the runner. Below, we explore three main methods to calculate the accumulated gap: the use of GPS devices, mobile applications and specialized software, and manual calculation.

Use of GPS devices

GPS devices have revolutionized how trail runners can measure and manage accumulated unevenness. These devices, which include advanced sports watches and handheld devices, provide accurate and real-time data on altitude and unevenness.

Key features of GPS devices:

• Barometric altimeters: Many GPS devices are equipped with barometric altimeters that improve the accuracy of altitude measurement by compensating for atmospheric pressure changes.
• Real-time updates: Runners can receive instant updates on the gap accumulated during their activity, allowing them to make informed decisions about their pace and effort.
• Post-training analysis: Data collected can be analyzed later to evaluate performance and plan future trainings.

Considerations when using GPS devices:

• Calibration: It is important to calibrate the barometric altimeter regularly to ensure accuracy of the data.
• Signal interference: In areas with poor signal coverage, such as deep valleys or dense forests, GPS accuracy may be affected.

Mobile applications and specialized software

Mobile applications and specialized software offer another accessible way to calculate the accumulated gap. These tools are ideal for runners who prefer to use their smartphones or computers to manage their workouts.

Advantages of mobile applications:

• Accessibility: Most apps are available for iOS and Android devices, allowing easy and convenient access.
• Data integration: Many applications integrate with popular fitness platforms, allowing data tracking and analysis in one place.
• Additional functions: In addition to calculating the unevenness, these applications often offer additional features such as route maps, calorie tracking and performance metrics.

Examples of applications and software:

• Strava: Provides detailed level tracking and allows users to compare their performance with other runners.
• Komoot: Ideal for route planning, Komoot provides detailed elevation profiles and uneven route suggestions.
• TrainingPeaks: This platform is designed for serious athletes who want a deep analysis of their performance, including the accumulated unevenness.

Limitations:

• Variable accuracy: The accuracy of the level calculation may vary depending on the GPS quality of the mobile device.
• Battery consumption: Continuous use of GPS and other intensive functions can quickly exhaust the battery of the mobile device.

Manual calculation

Although technological methods are predominant, manual calculation of accumulated unevenness remains a viable option, especially in situations where technology is unavailable or unreliable.

Procedure for manual calculation:

1. Topographic maps: Use detailed topographic maps to identify altitude changes along the planned route.
2. Recording of altitudes: Write down altitudes at key points of the route, such as peaks and valleys.
3. Summary of differences: Calculate the difference in altitude between each registered point and add the differences to obtain the total accumulated elevation.

Advantages of manual calculation:

• Technological independence: It does not depend on electronic devices, which makes it useful in remote areas without access to technology.
• Geographical understanding: Promotes a deeper understanding of the terrain and geography of the route.

Challenges:

• Limited accuracy: The accuracy of the manual calculation depends on the quality of the maps and the user's ability to interpret the data.
• Time consumption: It can be a laborious process and requires a significant investment of time to achieve precise results.

Weekly unevenness planning

Weekly unevenness planning is a crucial component for any trail runner that seeks to improve its performance and minimize the risk of injury. Proper management of accumulated unevenness not only optimizes training, but also allows a progressive adaptation of the body to the demands of the terrain. Then we explore how to set clear goals, distribute the gap in a balanced way throughout the week, and adapt the plan to different skill levels.

Setting objectives

The first step in weekly uneven planning is the setting of specific and achievable targets. These goals must be aligned with the rider's level of experience, his long-term goals and the features of the races for which he is preparing.

1. Definition of clear objectives: It is essential to define what is to be achieved with training. Is it improving endurance in long climbs? Or maybe increase speed in technical descents? Setting clear targets allows you to design a more effective training plan.
2. Short- and long-term objectives: It combines short-term goals, such as completing a certain amount of meters of unevenness in a week, with long-term goals, such as improving time in a specific race. This helps maintain motivation and provides a framework for assessing progress.
3. Review and adjustment of objectives: The objectives must be reviewed and adjusted regularly according to personal progress and circumstances. This includes considering factors such as the availability of time to train, the current physical state, and any changes in personal goals.

Balanced distribution of the difference

A balanced distribution of the unevenness throughout the week is essential to avoid overload and allow adequate recovery. Here are some strategies to achieve this:

1. Variety in training sessions: Alternate between high intensity days with a lot of unevenness and recovery days with less demand. This not only helps prevent exhaustion, but also improves the body's ability to adapt to different types of effort.
2. Incorporation of cross training: Cross-training, such as cycling or swimming, can be useful to maintain physical fitness without adding additional stress to joints and muscles. These exercises help improve cardiovascular endurance and overall strength, complementing uneven training.
3. Use of microcycles: Implement training microcycles, which are short loading and recovery cycles, can be beneficial. For example, a microcycle could consist of three days of intensive training followed by two days of active recovery.

If you prefer someone to plan the unevenness with you, use this checklist to choose online trail coach with real mountain experience.

Adaptation to different skill levels

The planning of the unevenness must be adapted to the capacities and experience of each runner. Here are some considerations for different skill levels:

1. Beginners: New runners in trail running should focus on building a solid endurance base before significantly increasing the unevenness. It is recommended to start with routes that have a moderate unevenness and gradually increase the difficulty.
2. Intermediate: runners with intermediate experience can benefit from the incorporation of specific uneven trainings, such as repetitions in hills or slope intervals. These exercises help to improve strength and technique on varied terrains.
3. Advanced: Advanced runners should focus on optimising performance by incorporating high-intensity training and simulation of race conditions. This includes training sessions at altitude or in technical terrain that challenge both endurance and technical skill.
4. Customization of the plan: Regardless of skill level, it is crucial to customize the training plan to fit individual needs. This may involve working with a coach or using specialized applications and software to monitor progress and adjust the plan accordingly.

Impact of unevenness on physical performance

Cumulative unevenness is a determining factor in the physical performance of trail runners. Understanding how it affects the human body can help athletes optimize their training and improve their race performance. This section explores the effects of unevenness on endurance, injury prevention and post-training recovery.

Effects on endurance

The accumulated unevenness challenges the aerobic and anaerobic capacity of the racers. As athletes climb and down hills, the body must adapt to constant changes in energy demand. This type of effort requires specific physical conditioning that focuses on improving cardiovascular and muscle endurance.

1. Oxygen consumption: In land with unevenness, oxygen consumption increases significantly. Rises require a greater effort of the cardiovascular system, which can lead to an increase in heart rate. This increase in oxygen demand forces the body to use its energy reserves more efficiently.
2. Anaerobic capacity: The steep slopes can lead the runner to work on its anaerobic threshold, where the body begins to produce lactic acid. Training in these conditions improves the body's ability to tolerate and eliminate lactate, delaying fatigue.
3. Race economy: The unevenness also affects the racing economy, which is the amount of energy a runner uses at a given speed. Improving race skills in irregular terrain can reduce energy spending and improve overall performance.

Injury prevention

Trail running on uneven terrain presents a high risk of injury due to the varied and often unpredictable nature of the terrain. However, a proper approach to training can mitigate these risks.

• Muscle strengthening: Constant ups and downs strengthen the muscles of the legs, especially quadriceps, ischiotibials and calves. Stronger muscles provide better stability and joint support, reducing the risk of injuries such as sprains and sprains.
• Proprioception and balance: Running on irregular terrain improves proprioception, which is the body's ability to perceive its position in space. Better balance and coordination can prevent falls and associated injuries.
• Progressive adaptation: Gradually introduce unevenness in training allows the body to adapt without overloading muscles and joints. A progressive approach is crucial to avoid overuse injuries.

Post-training recovery

Recovery after training on uneven terrain is essential to maintain optimal performance and prevent exhaustion.

1. Active recovery: Incorporating active recovery sessions, such as light walks or cycling, can help eliminate accumulated lactic acid and reduce muscle stiffness.
2. Adequate nutrition: After intense training in unevenness, it is vital to replenish glycogen stores and repair muscle tissue. Consuming a combination of carbohydrates and proteins within two hours after exercise can speed up recovery.
3. Rest and sleep: Adequate rest is essential for recovery. Sleeping enough allows the body to repair damaged tissues and strengthen the immune system, which is crucial for athletes who train in demanding conditions.
4. Recovery techniques: Methods such as cryotherapy, sports massages and the use of foam rollers can relieve muscle pain and improve blood circulation, thus accelerating the recovery process.

Good practices

Effective management of trail running altitude accumulation is a crucial component in improving performance and preventing injuries. Implementing good practices not only optimizes training, but also ensures a safe and sustainable progression. Below are some of the best practices that trail runners can adopt to manage the accumulated gap effectively.

Constant monitoring of progress

Constant monitoring of progress is essential for any trail runner that seeks to improve its performance relative to the accumulated unevenness. This monitoring allows the training to be adjusted according to personal objectives and physical responses of the body. Here are some methods and tools for effective monitoring:

• GPS devices and mobile applications: Using GPS devices and specialized mobile applications can provide accurate data on the accumulated unevenness in each training session. These devices not only record altitude, but also provide detailed performance analysis, which allows to identify patterns and areas of improvement.
• Manual recording and data analysis: Complementing the use of technology with a manual record can be beneficial. Keeping a training journal where details such as distance, accumulated unevenness, time and personal sensations are recorded can offer a more qualitative perspective of progress.
• Periodic reviews: Establishing periodic reviews, such as monthly or quarterly analyses, helps assess long-term progress. These reviews allow for adjustments to the training plan, ensuring that it remains aligned with established objectives.

Incorporation of strategic breaks

Rest is an essential component in any training program, especially when it comes to managing the accumulated unevenness. Incorporating strategic breaks into the training plan can prevent exhaustion and reduce the risk of injury. Here are some strategies to effectively integrate breaks:

• Active rest days: Instead of completely resting, opt for active rest days that include low-impact activities such as walking, swimming, or yoga. These activities promote recovery without adding additional stress to the body.
• Cycles of loading and unloading: Implementing loading and unloading cycles in training allows the body to adapt to the stress of accumulated unevenness. A typical cycle may include three weeks of progressive load increase, followed by one week of discharge with lower intensity and volume.
• Listen to the body: Learning to listen to the signals of the body is crucial. If you experience extreme fatigue, persistent pain, or lack of motivation, it can be a sign that you need more rest. Do not hesitate to adjust the training plan as necessary.

Variety of routes and terrain

The variety in the routes and terrain not only keeps the training interesting, but is also an effective strategy to manage the accumulated unevenness in a balanced way. Changing route and terrain offers multiple benefits:

• Adaptation to different conditions: Running on different types of terrain, such as rocky trails, dirt roads or sandy surfaces, helps to develop technical skills and improves the adaptability of the runner. This is especially useful to face the various conditions that can be found in a trail race.
• Mental stimulation: The variety on the routes avoids monotony and keeps the training mentally stimulating. Exploring new paths and landscapes can increase the motivation and enjoyment of training.
• Development of strength and endurance: Different terrains challenge the body in various ways, promoting the development of strength and endurance. For example, running on steep hills improves muscle strength, while technical descents develop balancing and control skills.

The key to successful trail running training is adaptability. By varying routes and terrain, you not only prepare yourself better for racing, but also enrich your experience as a racer.

In conclusion, implementing these good practices in managing the accumulated trail running gap can make a significant difference in the overall performance and well-being of the runner. Monitoring progress, incorporating strategic breaks and varying routes and terrain are effective strategies that, when consistently implemented, lead to continuous and sustainable improvement.

Common errors

In managing the accumulated unevenness in trail running, it is crucial to identify and avoid certain common errors that can negatively affect both the performance and health of the runner. Below are some of the most frequent errors and how to prevent them.

Level overload

One of the most common errors among trail runners, especially beginners, is uneven overload. This error occurs when you try to accumulate too much unevenness in a short period of time without proper preparation. Overloading can lead to significant physical exhaustion and increase the risk of injury.

Overloading not only affects the body physically, but can also impact psychologically, generating discouragement or frustration. To avoid this error, it is essential to plan the training in a way that allows a progressive adaptation to the increase of the level. This involves setting realistic and achievable goals, as well as incorporating days of rest and active recovery into the training plan.

Underestimation of terrain difficulty

Another common mistake is to underestimate the difficulty of the terrain. Not all unevenness is the same; inclination, surface type and climatic conditions can transform a seemingly simple route into a considerable challenge. Underestimation of the terrain can lead to excessive effort and premature wear and tear during the race.

To avoid this error, it is advisable to make a prior survey of the route, either physically or by using maps and specialized applications. In addition, it is important to consider factors such as altitude, which can affect aerobic capacity, and climate conditions, which can alter the difficulty of the terrain.

Lack of progressive adaptation

The lack of progressive adaptation is a mistake that is commonly observed in runners trying to quickly improve their performance without giving the body time to adapt to new demands. This approach can result in overuse injuries, such as tendinitis or stress fractures, and a stagnation of performance due to chronic fatigue.

To encourage progressive adaptation, it is essential to follow a structured training plan that includes loading and unloading phases. During the loading phases, the intensity and volume of training is gradually increased, while the discharge phases allow the body to recover and adapt to new loads.

In addition, progressive adaptation refers not only to the increase of the elevation, but also to the improvement of other physical capacities, such as strength and cardiovascular endurance. Incorporating muscle strengthening exercises and cross training can help improve overall performance and reduce the risk of injury.

In short, avoiding these common mistakes in managing the accumulated unevenness in trail running is essential to improve performance and enjoy this sport in a safe and sustainable way. The key is careful planning, progressive adaptation, and attention to body signals. By doing so, brokers can maximize their capabilities and minimize the risks associated with trail running.

Table: distance, unevenness and km-effort

The km-effort of the ITRA adds the distance and one hundredth of the positive slope: every 100 m of D+ count as 1 km more. These examples show how the hardness of a race changes with the unevenness (they are calculations, not concrete races):

Formula: ITRA, km-effort. Example of 65 km and 3,500 m taken from the definition itself.

At the time of training, the unevenness is planned the same as the volume: it is progressively raised, it is included lowered to prepare the muscle for eccentric work (Vernillo et al., 2017) and leaves weeks of discharge. The watches and apps (Garmin, Polar, Wahoo, Suunto...) measure the unevenness with barometer or GPS and can give different figures for the same route.

«When planning trail I look at three numbers each week: hours, kilometers and meters of unevenness. If you only look at miles, the mountain deceives you." — Marc Bañuls, coach with more than 15 years of experience

Frequently Asked Questions

What is the accumulated slope?

It is the sum of all the meters you climb (positive altitude, D+) or low (negative altitude, D-) along a route, not the difference between the highest point and the lowest. It is the figure used by trail races to describe their hardness and the figure that should be planned, along with distance, when preparing a test.

What's the difference between positive, negative and accumulated difference?

The positive elevation (D+) is the meters you go up and the negative (D-), the ones you go down. The accumulated slope is the sum of all the climb stages or all the descent along the route, not the difference between the highest point and the lowest. That is why two figures are given, for example D+ 1.200 m and D- 1.150 m, and the one most used to compare races is D+.

How is the km-effort calculated?

Adding the distance in kilometers and the positive slope in meters divided by 100. For example, 65 km with 3,500 m of D+ is equivalent to 100 km-effort, according to ITRA. It serves to compare the requirement of races with different profiles, although it does not take into account factors such as terrain, technique of descent or altitude.

Why do my watch and organization give different levels?

Each device measures altitude differently (barometer, GPS or elevation models) and applies its own smoothing, so the figures may vary. To plan, take the official race gap as a reference and use your watch to compare your own workouts with each other, always with the same device and configuration.

How does the unevenness affect speed?

On the rise, maintaining the same speed requires more energy, so the pace goes down; in the decrease the gravity helps, but the technique and control limit how much you can run. Therefore in trail it is advisable to plan for time, unevenness and perceived effort rather than for pace per kilometer, and specifically train both the climbs and the descents.

Is it necessary to adjust the diet due to the unevenness?

More unevenness usually means more hours of effort, and that changes most of all the energy and fluid you need during the race. Plan your intake for the expected hours, not for the kilometers, and try it on your long workouts. For specific guidelines with sources, see our ultra trail nutrition guide.

What equipment is essential to manage the unevenness?

Trail shoes with good grip, layered clothing adapted to the expected time, a system to bring water and food, and a watch or GPS to control the unevenness. Canes can help in steep, long climbs if you've practiced them before. Always check the mandatory material required by the rules of your race.

Sources

1. ITRA. Discover Trail Running: km-effort and ITRA points.
2. Vernillo G, et al. Biomechanics and physiology of uphill and downhill running. Sports Med. 2017;47(4):615-29.
3. Buist I, Bredeweg SW, van Mechelen W, Lemmink KA, Pepping GJ, Diercks RL. No effect of a appreciated training program on the number of running-related injuries in novice runners: a randomized controlled trial. Am J Sports Med. 2008;36(1):33-9.