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Rethinking Speedwork: How New Runners Can Safely Introduce Intensity

Sep 03, 2026 • 5 min read • views

Introduction to Running Intensity

Beginning runners often make a common error: they rush to add intensity to their training without establishing a solid aerobic base. Dr. Anh Bui, a physical therapist and running coach, draws a parallel to weightlifting, stating that you wouldn’t start with max lifts right off the bat. Instead, starting with lower intensity and higher repetitions is key for progress.

The Importance of Aerobic Base

The early phase of a running program, predominantly characterized by easy runs, serves multiple purposes. This foundation is essential for acclimatizing your muscles, tendons, and bones to the demands of running. Additionally, easy runs enhance blood flow and oxygen supply, improving the body’s capability to generate energy for longer durations. "You can achieve a lot from consistent, easy running," Bui asserts.

Adding Intensity Wisely

After establishing a sufficient aerobic base, it becomes appropriate to introduce more intense workouts. Greg Laraia, a running coach at Motiv in New York City, emphasizes the benefits of intensity, including enhanced speed over distances and improved body mechanics. However, the critical question remains: when is it right for a runner to incorporate this intensity safely?

Indicators You're Ready for Intensity

Determining readiness for increased intensity is nuanced, relying on individual running history and fitness genetics. However, Bui and Laraia provide valuable benchmarks to consider.

You’ve Built Volume

Volume, simply defined as the number of miles run per week, often indicates readiness for speedwork. While the exact mileage can differ based on the individual, Bui suggests that around 15 to 20 miles per week is a reasonable target for beginners. This volume allows runners to adapt physically before layering on intensity.

You Understand Easy Running

More crucial than merely hitting specific mileage is the ability to run those miles at a truly easy pace. If a runner completes 15 miles but at a high intensity, then that intensity is already too much. Laraia points out that one of the most significant mistakes newcomers make is misjudging their effort levels. Ideally, you should be able to converse comfortably while completing your base mileage, gauged through methods like the talk test.

Consistency Matters

Consistency in training is essential for adaptation. Laraia suggests aiming for at least three runs a week for a minimum of six weeks. Without consistency, the physiological adaptations you’re aiming for simply won’t occur.

Recovery is Key

Being well-recovered is pivotal before intensifying your training. Bui highlights that your energy levels should remain high throughout the day, and soreness from previous runs should resolve within 48 hours. Adequate sleep and stress management are also critical as your body adjusts to harder workouts. This holistic approach is vital in ensuring your body is ready for increased stress.

Injury History

If you have a history of running injuries, it’s wise to proceed with caution. Bui warns that it may take longer for some to build the strength needed to handle greater stress. For such individuals, focusing on easy running for a prolonged period is advisable before gradually incorporating faster workloads.

Strategies for Safely Adding Intensity

Once you meet the criteria mentioned earlier, easing into intensity can begin. However, it's important to remember that only one variable should change at a time—either increase mileage or intensity, but not both simultaneously.

Implement Strides

Both experts recommend starting with strides—brief, accelerated efforts of 15 to 30 seconds during an easy run. Bui emphasizes that strides help improve running mechanics without imposing strict pace targets. For added benefits, try them on inclines to further engage your muscles and form.

Consider Fartleks

Fartlek training allows for an intuitive way to introduce intensity, combining periods of faster running with rest intervals. Bui favors this method for beginners, encouraging them to experiment with their paces without the need for predetermined targets. "The goal is to play with different speeds," she states.

Monitor Your Intensity

As you incorporate speedwork, evaluating your effort is essential. The talk test serves as a reliable measure—strive to maintain a conversational tone, even as you push your limits. Additionally, Laraia advises keeping track of perceived exertion levels, aiming for a score of 7 to 9, depending on the duration of each effort.

Follow the 80/20 Rule

This guiding principle stipulates that 80% of your running should remain easy, while only 20% can be high intensity. Many new runners inadvertently push the ratio closer to 50%, which can lead to burnout or injury. Bui stresses the importance of recognizing and adhering to this balance.

Pay Attention to Your Body

Finally, your body's signals are critical indicators of how well you’re handling the new intensity. Classic signs of overstressing include shin splints and persistent aches. Bui warns that if soreness lingers beyond two days following a hard workout, it's likely time to reassess your approach.

Conclusion

Introducing intensity into your running regimen is a necessary step for progress, but rushing this process can lead to injuries that set you back considerably. By focusing on building a strong aerobic base first and listening to your body’s cues, you can safely enhance your performance while minimizing risks.