How to run a faster 5K

Going from 27:30 to 25:00 in the 5K means running every kilometre 30 seconds faster. That adds up to two and a half minutes, and “run more” on its own will not find them. Below: which workouts make up the week, what pace each one needs, and how to avoid giving time away in the first kilometre of the race.

How to run a faster 5K: start with an honest benchmark

Every pace in this article comes from your current result. Use a race or an all-out 5K time trial from the past month, ideally on a track or a flat course. If you ran a 10K recently, Riegel’s formula converts it: a 50:00 10K is roughly a 23:59 5K, and a 55:00 10K is roughly 26:23.

To see how your time compares with other runners, read our piece on the average 5K time by age. This one is about the next step: what to change in training.

Easy running fills most of the week

In a 2010 review, Stephen Seiler pulled together descriptive studies of national- and international-level athletes training 10 to 13 times a week. About 80% of their sessions are at low intensity and about 20% include hard work such as intervals at roughly 90% of VO₂max. He found no convincing evidence that adding more high-intensity intervals gives already well-trained athletes bigger long-term gains.

For recreational runners there is a trial by Muñoz, Seiler and colleagues (2014). Thirty runners trained for ten weeks on one of two plans. One spent about 77% of training time easy, 3% moderate and 20% hard. The other spent much more time at moderate effort: 46%, 35% and 19%. Both groups improved their 10K time, by 5.0% and 3.6%. The difference between groups was not statistically significant, but among runners who stuck closest to their assigned plan, the mostly-easy plan produced the bigger gain.

What this means for your week: easy runs should be truly easy, at a pace where you can talk in full sentences. Our guide to zone 2 running shows how to find that pace by heart rate.

Intervals and threshold runs: paces from your current time

Most plans have one or two hard sessions a week, and each does a different job. Intervals are repeats of 3 to 5 minutes slightly faster than 5K race pace, with easy jogging between them. A threshold (tempo) run is 20 to 30 minutes at a steady pace where talking is hard but the pace does not fade.

The paces below come from the Daniels model, the same one used by our VO₂max calculator. Enter a race result there and it returns easy, threshold and interval paces for any time.

Interval pace sits faster than race pace. A 25:00 runner races at 5:00 per km, but runs intervals at 4:45–4:57. That is why paces are set from what you can run now: if you base intervals on your goal time, every repeat ends up harder than planned.

The method itself is old. Emil Zátopek popularised interval training in the 1950s, and, as Véronique Billat notes in a 2001 review, coaches have set repeat speeds from race speeds between 800 m and 5000 m ever since.

A typical 5K interval session is 5 × 1000 m at interval pace with 2 to 3 minutes of jogging between repeats. If 1000 m feels too long for now, start with 4 × 800 m. A typical threshold session is 20 minutes continuous, or 3 × 8 minutes with a minute of jogging between. Both start with a 15-minute easy warm-up and finish with a cool-down.

Strides after an easy run

Strides are 4 to 6 bursts of 15 to 20 seconds at a fast but relaxed effort, with a walk between them until your breathing settles. Add them to the end of an easy run once or twice a week. This is coaching practice: we did not find studies that test strides on their own against 5K performance.

Strength and plyometrics add speed without extra miles

A Finnish group led by Paavolainen (1999) followed well-trained endurance athletes for nine weeks. Both groups did the same total training volume, but in the experimental group of 10 people, 32% of training was replaced with explosive strength work, against 3% in the control group of 8. Only the experimental group improved its 5K time, and its VO₂max did not change. The authors put the gain down to better running economy and muscle power.

A systematic review by Blagrove and colleagues (2018) covered 24 studies of strength training in middle- and long-distance runners. Running economy generally improved by 2–8% compared with control groups, and time-trial performance over 1.5–10 km also tended to improve, though not in every study. The authors conclude that two to three strength sessions a week, mixing different types of strength work, are likely to help runners.

A sample week with five runs

This is not a plan from any study. It is a common layout built from the pieces above. Take the paces from the table for your current 5K time.

If you run three or four times a week, keep one hard session and alternate an interval week with a threshold week. Every other run stays easy. That is also the simplest way to improve 5K time as a beginner.

Race-day pacing: turn your goal into a pace

A goal time is easier to run when you know it as a pace per kilometre or mile and as a lap time on the track. Then you can check it against your watch at every marker.

In their 2008 review of pacing strategies, Abbiss and Laursen conclude that in events lasting longer than two minutes, a more even distribution of pace may improve finishing times. The 5K is one of those events.

Most time is lost in the first kilometre. Your legs are fresh, the crowd pulls you along, and the pace easily ends up well ahead of plan. You pay for it in kilometres three and four. Runners usually hold the first kilometre right at goal pace and save the push for the last one. The race splits calculator lays out every kilometre or mile, either even or with a faster second half.

When to expect results

The trials above lasted nine to ten weeks. That is a sensible horizon for you too: after two or three months, run another 5K test, recalculate your paces and train from the new number.

The Daniels model and Riegel’s formula assume a flat course and mild weather. Heat, wind and hills make the same effort slower, so on those days run by feel as well as by the watch.