Speed Workouts for Half Marathon

When it comes to half marathon training, endurance is often the first thing that comes to mind. After all, covering running for about 2 hours is no small feat. However, if you’re looking to not just finish but also improve your time and overall performance, integrating speed work into your half marathon training program is essential.

Speed workouts for half marathons are designed to increase your running pace, enhance your running economy, and elevate your racing efficiency, making them a crucial component of distance running training.

The importance of speed work in distance running cannot be overstated. By pushing your body to run at speeds faster than your target race pace, you adapt to handle faster leg turnover and improve your cardiovascular system’s ability to deliver oxygen to your muscles.

This physiological adaptation allows you to sustain higher speeds for longer periods, which is critical for achieving your best half marathon time.

Speed Workouts for Half Marathon

Incorporating speed workouts into your half marathon training can bring about significant benefits.

These benefits extend beyond just faster times; they include improved running form, increased metabolic efficiency, and enhanced mental toughness.

Speed sessions vary in intensity and duration, offering a range of workouts that can fit into different phases of your training plan. From intervals on the track to tempo runs along your favorite routes, each type of speed workout has its unique way of elevating your half marathon performance.

They challenge you in different ways, making you a more versatile and resilient runner. Whether you’re aiming to set a new personal best or simply want to cross the finish line feeling strong, incorporating speed workouts into your half marathon race preparation is a game-changer.

Understanding Speed Workouts

Speed work is a term used to describe a variety of training exercises focused on increasing a runner’s pace. It encompasses workouts such as intervals, tempo runs, and sprints, which are designed to push a runner’s speed beyond their comfortable endurance pace.

The relevance of speed work in half marathon training cannot be overstated. While the half marathon is primarily an endurance event, incorporating speed workouts helps runners improve their pace, making the race not just about finishing, but finishing well and possibly setting a personal record.

The physiological benefits of speed work are significant and multifaceted.

  • Improves VO2 max, which is the maximum amount of oxygen your body can utilize during intense exercise. A higher VO2 max means your body can use more oxygen efficiently, enhancing your overall endurance and speed.

  • Increase your lactate threshold, the point at which your body begins to fatigue at a faster rate. Training at or just above this threshold helps your body become more efficient at clearing lactate, allowing you to maintain a faster pace for longer.

  • Improve running economy, which is how efficiently a runner uses oxygen at a given pace. A better running economy means less energy is expended for the same pace, making your running more efficient overall.

The Role of Speed Work in Half Marathon Training

Speed sessions complement long runs and recovery days by providing a balanced training regimen that targets all aspects of running performance.

While long runs build endurance and mental toughness, speed work hones in on pace, power, and efficiency. This combination ensures that a runner is not only capable of covering the distance but doing so at an optimal speed.

There are common misconceptions about speed training among distance runners. One is that speed work is only for sprinters or short-distance runners. This is not true; half marathoners and marathoners can greatly benefit from the pace improvements and physiological adaptations provided by speed workouts.

Another misconception is that speed work increases the risk of injury. While there is an inherent risk in all forms of physical training, incorporating proper warm-ups, cooldowns, and following a well-structured plan tailored to your current fitness level can mitigate these risks.

Half Marathon Specific Workouts

By integrating a variety of speed exercises into their training, runners can achieve a comprehensive improvement that translates into faster, more efficient running. Below, are four key types of speed workouts: intervals, tempo runs, Fartleks, and hill repeats, each with its unique benefits and methods of implementation.


Interval running involves short, intense bursts of running followed by a period of rest or low-intensity running. The purpose of interval training is to increase speed and cardiovascular efficiency, allowing runners to push their pace beyond their comfort zone in a controlled manner. This type of workout is particularly beneficial for half marathoners looking to improve their race pace and endurance.


  1. 400-meter repeats: After a warm-up, run 400 meters at a pace faster than your goal half marathon pace, followed by 1-2 minutes of walking or jogging for recovery. Repeat this 6-10 times depending on your fitness level.

  2. Ladder workout: Start with a 200-meter run at a fast pace, followed by 200 meters of easy jogging. Then move up to 400 meters fast, 400 meters easy, then 800 meters fast, 800 meters easy, and back down to 400 and 200 meters at the same intervals. This challenges endurance and speed adaptability.

Tempo Runs

Tempo runs are sustained efforts at a controlled, hard pace, typically around the lactate threshold where the body begins to accumulate lactate more rapidly.

These runs train the body to process lactate more efficiently, improving endurance at faster speeds. Tempo runs are a staple for half marathoners aiming to maintain a strong pace throughout the race.

What is the best tempo workout for a half marathon?

  1. 20-minute tempo run: After warming up, run for 20 minutes at a pace that feels “comfortably hard,” where you can speak in short phrases but not sustain a conversation. This should be done at or slightly above your planned half marathon pace.

  2. Tempo intervals: Break the tempo run into shorter segments with brief rest periods. For example, run 10 minutes at tempo pace, rest for 2 minutes, then repeat. This can make the workout more manageable while still reaping the benefits.


Fartlek training, Swedish for “speed play,” combines continuous running with speed intervals in an unstructured format. This flexibility allows runners to experiment with pace and endurance, making it an enjoyable way to improve speed.

Fartleks are beneficial for building speed and endurance, with the added advantage of being adaptable to how a runner feels on a given day.


  1. Classic Fartlek: Run for 60 minutes, alternating between 2 minutes at a fast pace and 3 minutes of easy jogging. Adjust the durations and intensities based on your fitness level and how you feel during the workout.

  2. Lamp post Fartlek: During a run, sprint between two lamp posts, then jog or walk to the next. Continue this pattern for a set duration, allowing for spontaneous adjustments in speed and recovery.

Hill Repeats

Hill repeats involve running up a hill at a hard effort, then recovering by jogging or walking down. These workouts build strength, speed, and power, as well as improve running economy by forcing the body to work against gravity. Hill repeats are excellent for half marathoners looking to improve their uphill and overall running performance.


  1. Short hill sprints: Find a steep hill and sprint up for 30 seconds, then recover by walking or jogging down. Repeat 8-10 times, focusing on maintaining effort and form throughout.

  2. Long hill repeats: Choose a moderate hill and run up for 1-2 minutes at a hard but sustainable pace. Jog or walk down for recovery. Repeat 4-6 times, aiming for consistency in effort and pace.

Incorporating these speed workouts into your half marathon training plan will not only improve your speed and endurance but also enhance your running efficiency, making you a stronger, more versatile runner ready to tackle the challenges of race day.

Implementing Speed Workouts Safely and Effectively

Incorporating speed sessions into your half marathon training requires a thoughtful approach to maximize benefits while minimizing the risk of injury.

Here are essential strategies to ensure your speed training is both safe and effective:

Tips for Warming Up Properly to Avoid Injury

  • Dynamic Stretching: Begin with dynamic stretches to increase blood flow to the muscles and improve range of motion. Examples include leg swings, arm circles, and lunges.

  • Easy Jog: Start with at least 10 minutes of easy jogging to gently raise your heart rate and prepare your body for the intensity of speed work.

  • Strides: Finish your warm-up with a few short, controlled sprints (strides) to activate your fast-twitch muscle fibers and ready your body for the fast pacing of interval or tempo work.

Importance of Listening to Your Body and Modifying Workouts as Necessary

  • Adjust Intensity: Pay attention to how you feel during workouts. If you’re feeling fatigued or strained, it may be wise to reduce the intensity or take an extra rest day.

  • Recognize Warning Signs: Be mindful of any pain or discomfort. Early signs of injury should not be ignored; rest or seek medical advice if necessary.

  • Adapt to Conditions: Consider external factors such as weather, stress, and sleep. These can affect performance, so adapt your training accordingly.

Advice on Balancing Speed Work with Recovery and Long-Distance Runs

  • Schedule Wisely: Ensure there’s a balance between hard speed workouts, easy recovery runs, and long-distance runs throughout your training week. Avoid scheduling intense sessions back-to-back.

  • Emphasize Recovery: Incorporate rest days or easy runs after hard workouts to allow your body to recover and adapt to the training stress.

  • Progress Gradually: Increase the intensity and volume of speed work gradually over time to prevent overloading your body and risking injury.

Common Mistakes to Avoid

To get the most out of your speed training and to stay healthy on the road to your half marathon, be mindful of these common pitfalls:

Overtraining and Neglecting Recovery

  • Overtraining can lead to burnout and injury. Ensure your training plan includes adequate rest and recovery runs to allow your body to repair and strengthen.

  • Recovery is as critical as the workout itself. Neglecting it can hinder performance improvements and lead to chronic fatigue.

Ignoring Pain and Potential Injuries

  • Pain is the body’s way of signaling that something is wrong. Ignoring it can turn minor niggles into serious injuries.

  • Adopt a proactive approach to pain management, including rest, ice, compression, and elevation (RICE), and seek professional advice when necessary.

Lack of Consistency or Variation in Speed Workouts

  • Consistency is key to seeing improvements from speed work. Irregular training can lead to stagnation or regression in performance.

  • Incorporating a variety of speed workouts can prevent boredom, target different aspects of running fitness, and reduce the risk of overuse injuries.

By following these guidelines, you can safely integrate speed workouts into your half marathon training, setting the stage for personal bests and a rewarding race day experience.

Diego Alcubierre, a passionate runner and coach, started his journey at 26 with a 10k time of 1:06:23 and has since slashed 30 minutes off his personal record. With five running and coaching certifications, Diego is committed to sharing his expertise and proven strategies to help runners of all levels enhance their performance, stay motivated, and enjoy the journey of running. At Bannister, he simplifies complex training concepts, empowering you to achieve your running goals.