Workouts to Build Speed Endurance so You Finish Your Races Strong and Fast
The home stretch of a race exposes exactly what you have left in the tank. Your legs are heavy, your breathing is labored, and the finish line is coming up. Finding another gear in that moment isn’t just a matter of mental toughness; it’s a skill you can train.
Some runners may assume they have to choose between running fast and running long. However, the real key is learning how to do both at the same time. That’s where speed endurance—your body’s ability to maintain a fast pace over longer distances—comes into play.
In fact, boosting speed endurance is why most training plans include one to two weekly speed workouts.
Research backs up this training strategy. For example, a study published in the Journal of Strength and Conditioning Research in 2018 found that sprint interval training improved 3,000-meter time, extended time to exhaustion, and boosted power. In the study, 16 male and female trained trail runners ran at maximal intensity for 30 seconds with four minutes of recovery, going for four to seven reps, and doing this workout three times a week.
A 2019 meta-analysis also found that sprint training kicked up VO2 max, which can make faster speeds feel easier so you can hold on to the pace. And, finally, a study published in 2025 in Frontiers in Physiology suggests that sprint interval training, done twice a week for six weeks, leads to more improvement in time to exhaustion and faster finishes in the 100-, 400-, and 3,000-meter distances, compared with traditional long-distance training.
This doesn’t mean that doing interval workouts all the time will lead to better results. “Keep in mind that more is not better,” Ben Delaney, head of training at New York Road Runners, previously told Runner’s World. “Workouts should be structured—warmup, hard efforts, recovery or moderate efforts, and cooldown—and avoid back-to-back days.”
Also, the type of interval workout you incorporate into your plan depends on your race distance and goals.
For example, runners who want to improve their speed endurance for a 5K should practice 400- to 800-meter repeats at mile pace (around VO2 max) or slightly faster, advises certified run coach Alison Marie Helms, PhD, CPT. “This provides the most potential for improving VO2 max and oxygen delivery to sustain speed,” Helms told Runner’s World.
For marathon or half marathon training, Helms recommends 1,000-meter or mile repeats at race pace or slightly quicker. “Training near or slightly faster than race pace helps the body adapt, boosting running efficiency and economy,” Delaney adds.
Customizable Speed Workouts
Depending on your race distance, try one of these speed workouts from John Honerkamp, RRCA- and USATF-certified run coach.
Matt Rudisill is an Associate Service Editor who has been with Runner's World since 2025. A Nittany Lion through-and-through, Matt graduated from Penn State in 2022 with a degree in journalism and worked in communications for the university's athletic department for three years as the main contact and photographer for its nationally-ranked cross country and track & field teams. Matt was also heavily involved in communications efforts for Penn State football, men's basketball, and women's gymnastics. In his role with Runner's World, Matt has interviewed Olympians, world champions, and countless experts in the field to create service content that helps runners of all ages and experience levels train smarter and race faster. When he’s not out jogging, Matt can be found tweeting bad takes about the Phillies or watching movies.