This article is part of our 10K series. From 5K to 10K was about covering the distance. This one is for runners who can already run 6.2 miles (10km) and want to run it faster.
There are hundreds of 10K workouts, and most are variations on a handful of sessions. These are the five we’d keep if we had to drop everything else, in rough order of how much they matter for most runners.
What makes a 10K faster
Three things set your speed in any distance race.1 Your maximal oxygen uptake (VO₂ max) is the size of your aerobic engine. Your lactate threshold is how much of that engine you can use before fatigue builds rapidly. And your running economy is how much oxygen you need to hold a given pace.
A 10K asks for all three. It’s run at about 90% of VO₂ max, right around your threshold (at it if your 10K takes close to an hour, a little faster if you’re quicker than that). And it lasts long enough that you need solid endurance to hold the pace through the last 2 miles (3km).
So 10K training is a mix. When researchers looked at what best predicted the performances of world-class distance runners, the answer was the total volume of easy running, followed by tempo runs and short intervals.2 The five sessions below cover the same ground: a lot of easy running, threshold work, and a smaller amount of faster running.
Before you start
These sessions are for you if:
- You can run 10K comfortably at an easy effort.
- You’ve been running at least three times a week for three months or more, without pain that lingers from one run to the next.
- Most of your running is easy. Hard sessions only work on top of easy mileage in heart rate zones 1 and 2.
If you’re not there yet, work through From 5K to 10K first. You’ll get faster from the extra easy running alone.
The five sessions at a glance
| Session | Example | Effort | What it builds | |
|---|---|---|---|---|
| 1 | Long easy run | 75–90 minutes easy | 3–4 out of 10, zones 1–2 | Endurance to hold your pace to the finish |
| 2 | Threshold intervals | 3 × 8 minutes, 2-minute jog recoveries | 8 out of 10, zone 4 | Lactate threshold |
| 3 | 10K-pace reps | 4 × 1 mile (1.6km), 2-minute jog recoveries | 8–9 out of 10, zone 4 into zone 5 | Race pace, and the judgment to hold it |
| 4 | VO₂ max intervals | 5 × 3 minutes, 2–3 minute jog recoveries | 9 out of 10, zone 5 | VO₂ max |
| 5 | Progression run | 5 miles (8km), each part faster than the last | 4 out of 10, building to 8 | Pacing and a strong finish |
Session 1 is an easy run. Sessions 2 to 5 are hard sessions. You won’t run all four hard sessions in one week; fitting them into your week explains which to run when.
Finding your paces
Every session here can be run on effort alone. If you have a recent 10K time, you can add pace targets. This is how they work out for a runner with a 55:00 10K:
| Session pace | Compared with 10K pace | Example: 55:00 10K |
|---|---|---|
| Easy and long runs | Whatever keeps you in zones 1–2. Often 1.5–2.5 minutes per mile (1–1.5 minutes per km) slower. | About 10:30–11:30 per mile (6:30–7:10 per km) |
| Threshold | About 5–10 seconds per mile (3–6 seconds per km) slower | About 8:58 per mile (5:34 per km) |
| 10K pace | — | 8:51 per mile (5:30 per km) |
| VO₂ max | About 20 seconds per mile (12 seconds per km) faster, close to 5K race pace | About 8:30 per mile (5:17 per km) |
Use the pace you can run now, not the pace you hope to run. Your paces come down as your fitness improves, and a new race time is the signal to update them. When pace and effort disagree, go by effort: heat, hills, wind and tired legs all slow you down at the same effort. The heart rate zones here follow the five-zone model in understanding heart rate zones.
The warm-up and cooldown for every hard session
Sessions 2, 3 and 4 all start and finish the same way. Warm up with 10–15 minutes of easy running in zone 2, then 3–4 strides. Easy run with strides explains how to run them, and a short set of running drills before the strides is a useful extra. Cool down with 10 minutes of easy running, then a few minutes of walking.
1. The long easy run
| Session | 75–90 minutes of easy running, about 7–10 miles (11–16km) for most runners |
| Effort | 3–4 out of 10. Zones 1 and 2, full sentences. |
| How often | Once a week, all year round |
Why it works. The 10K is an aerobic event, and easy running is what builds your aerobic system: a stronger heart, more capillaries around your muscle fibers and more mitochondria (the parts of your cells that use oxygen) inside them. Successful endurance athletes do roughly 80% of their training at low intensity,3 and the long run is the biggest single piece of it. Running further than race distance also makes 6.2 miles feel short, which is what lets you hold your pace over the last 2 miles (3km) of a race.
How to run it. Keep all of it in zones 1 and 2. If your heart rate drifts into zone 3, slow down, and walk the hills if you need to. A long run that turns into a steady run takes days to recover from and leaves you tired for the sessions that make you faster.
Build up gradually, adding about 5–10 minutes every week or two, with a shorter long run every third or fourth week. Keep it under roughly a third of your weekly distance. If your long run is much more than that, add to your other easy runs first; building weekly mileage safely explains why.
If you’re only going to change one thing in your training, make it this. More easy running, including a longer long run, is where most runners find their first few minutes. Why easy runs should feel easy covers the evidence.
2. Threshold intervals
| Session | 3 × 8 minutes at threshold, with 2-minute easy jog recoveries |
| Effort | 8 out of 10. Comfortably hard: a few words at a time. Heart rate rising into zone 4 (about 80–90% of max heart rate). |
| Pace | About 5–10 seconds per mile (3–6 seconds per km) slower than your current 10K pace |
| Total hard running | 24 minutes, building to 30–35 |
Why it works. Your lactate threshold is the fastest pace you can sustain before fatigue builds rapidly, and 10K pace sits right next to it. Raise your threshold and your 10K pace rises with it.4 Breaking the work into intervals lets you spend more time at threshold effort, for less fatigue, than one continuous run at the same pace would. That’s the reasoning behind the threshold interval training now common among elite distance runners.5
How to run it. Stay in control. You should finish each rep knowing you could have carried on for several more minutes; if you couldn’t, you were running at 10K pace or faster, and that’s a different session. Keep the recoveries to two minutes of slow jogging, because the short recovery is what keeps this a threshold session. Run the reps evenly, so the third is the same pace as the first.
Judge the first rep by effort. Your heart rate takes a few minutes to catch up, so it may not reach zone 4 until late in the rep.
How to progress it. Move to 4 × 8 minutes, then 3 × 10 minutes, then 3 × 12 minutes. Add time before you add speed.
If you’ve never done a hard session, start with the shorter reps in our threshold intervals session and build up to this one.
3. 10K-pace reps
| Session | 4 × 1 mile (1.6km) at 10K pace, with 2-minute easy jog recoveries |
| Effort | 8–9 out of 10. Heart rate in zone 4, touching zone 5 on the last reps. |
| Pace | Your current 10K pace, or a goal pace a few seconds per mile quicker |
| Total hard running | 4 miles (6.4km), building to 5 miles (8km) |
Why it works. This is the most race-specific session of the five. It teaches your body and your head exactly what race pace feels like, so you can find it on race day without staring at your watch. It also builds your ability to keep running at that pace as fatigue builds, which is what the second half of a 10K demands.
How to run it. Aim to hit the pace, not beat it. The goal is to get every mile within a few seconds of target; running the reps faster turns this into a different session and teaches you the wrong pace.
Set a realistic goal pace. If you’re aiming for a personal record (PR), a goal pace up to about 5–10 seconds per mile (3–6 seconds per km) quicker than your last 10K is reasonable. If you can’t hold it for all four reps, it’s too ambitious for now.
Jog the two-minute recoveries very easily, walking for the first 30 seconds if you need to. A flat, measured route helps. A track is ideal (a mile is just over four laps), but a flat path with a watch works too.
How to progress it. Move to 5 × 1 mile (1.6km), then cut the recoveries to 90 seconds. Experienced runners can build to 6 × 1 mile. When five reps at goal pace feel controlled with 90-second recoveries, you’re ready to race at that pace.
4. VO₂ max intervals
| Session | 5 × 3 minutes hard, with 2–3 minute easy jog recoveries |
| Effort | 9 out of 10. Hard but controlled. Heart rate rising into zone 5 (90–95% of max heart rate) by the end of each rep. |
| Pace | About 20 seconds per mile (12 seconds per km) faster than 10K pace, close to your 5K race pace |
| Total hard running | 15 minutes, building to 16–20 |
Why it works. VO₂ max is the ceiling on your aerobic fitness, and a 10K is run at about 90% of it. Raise the ceiling and everything underneath moves up too. The most effective way to raise it, once you have a base of easy running, is intervals that hold you at or near it for a few minutes at a time.6 In one well-known study, runners who did 4 × 4 minutes at 90–95% of max heart rate improved their VO₂ max by about 7% in eight weeks, while runners doing the same amount of work as easy or threshold running saw almost no change.7 After a few weeks of running faster than race pace, 10K pace also starts to feel more manageable.
How to run it. Don’t sprint the first rep. It should feel almost too easy for the first minute, and if your last rep is much slower than your first, you started too hard. Finish each rep able to run one more, since this is 9 out of 10 and not all-out. Keep the recoveries as an easy jog; if your breathing hasn’t settled before the next rep, jog more slowly or walk.
How to progress it. Move to 4 × 4 minutes with 3-minute jog recoveries, then 5 × 4 minutes. Keep the total hard running between about 12 and 20 minutes. More isn’t better.
This is the hardest session of the five, and the one to add last. Our guide to VO₂ max for runners has more sessions, including hill repeats, and a six-week build-up.
5. The progression run
| Session | 5 miles (8km) continuous: 2 miles (3km) easy, 2 miles (3km) steady, final mile (1.6km) at threshold |
| Effort | 4 out of 10, then 6–7, then 8. Zone 2, then zone 3, then zone 4. |
| Pace | Starts at easy pace. The final mile is between threshold pace and 10K pace. |
| Total hard running | 3 miles (5km) above easy |
Why it works. The most common way to lose time in a 10K is to start too fast and fade. Research on pacing shows that for races of this length, an even pace, or a slightly faster second half, generally gives the best result.8 The progression run is practice for exactly that: you start slower than you’d like, hold back through the middle, and run your fastest mile last, on tired legs. It also gives you three miles of quality running with less strain than an interval session, so it’s a good choice for a week when you feel a little flat.
How to run it.
- Miles 1–2, easy: zone 2, the same effort as any easy run. This is your warm-up.
- Miles 3–4, steady: short sentences, zone 3. Purposeful, but well within yourself.
- Mile 5, threshold: 8 out of 10, zone 4, finishing at about 10K pace. Strong, not a sprint.
- Cooldown: walk for a few minutes, or jog very easily for 5–10 minutes.
How to progress it. Lengthen the run to 6 miles (10km), with 2 miles easy, 2 miles steady and 2 miles at threshold. Don’t make the final section faster than 10K pace.
Our 5K progression run explains the session in more detail, along with what’s happening in your body as the effort rises.
Fitting them into your week
How many hard sessions
Sessions 2 to 5 are all hard sessions, and each one needs recovery. The long run stays in every week.
| Runs per week | Hard sessions | Everything else |
|---|---|---|
| 3 | 1 | Easy, including the long run |
| 4–5 | 1–2 | Easy, including the long run |
| 6–7 | 2 | Easy, including the long run |
Keep at least one easy day or rest day between hard sessions, and between a hard session and the long run.
Which session when
If you’re training for a race, the sessions fit into phases. Each phase builds on the one before:
| Phase | Length | Hard sessions | Long run |
|---|---|---|---|
| Base | 6–8 weeks | None. Easy running, with strides once or twice a week. | Build toward 75–90 minutes |
| Build | 4–6 weeks | Threshold intervals every week. With two hard sessions, add the progression run. | Hold at 75–90 minutes |
| Race-specific | 3–4 weeks | 10K-pace reps every week. With two hard sessions, alternate VO₂ max intervals and threshold intervals as the second. | Hold, or shorten slightly |
| Taper | 7–10 days | One short session: 3 × 1 mile (1.6km) at 10K pace, five or six days before the race. | About 60 minutes the weekend before |
If you’re not training for a specific race, rotate them. Run threshold intervals one week, 10K-pace reps the next, VO₂ max intervals the week after, then a progression run in a lighter week.
A sample week
A four-run week in the build phase might look like this:
| Day | Session |
|---|---|
| Monday | Rest |
| Tuesday | Threshold intervals: warm-up, 3 × 8 minutes with 2-minute jogs, cooldown |
| Wednesday | Rest or cross-training |
| Thursday | 40 minutes easy + strides |
| Friday | Rest |
| Saturday | Long easy run: 75 minutes |
| Sunday | 30–35 minutes easy |
With a fifth run, add a progression run on Thursday and move the easy run with strides to Wednesday.
After each hard session, the next day is easy or off. Active recovery vs. rest days explains how to choose.
Common mistakes
The most common error is running the hard sessions too hard: threshold reps at 10K pace, or 10K-pace reps at 5K pace. Each session has its own pace for a reason. The mirror image is running the easy days too hard. If your easy runs drift into zone 3, you’ll arrive at the hard sessions tired and get less from them.
Two hard sessions a week is the limit for almost everyone, because a third takes away recovery without adding fitness. Don’t add sessions and mileage together either; hold your weekly distance steady for the first few weeks of a new hard session.
Skipping the long run is easy to do, since it’s the least exciting session of the five, but it’s the one that matters most. And don’t test your fitness in every session. Sessions are for training, so save the all-out efforts for races.
Building your 10K week
A faster 10K comes from a bigger aerobic engine, a higher threshold and better economy, and these five sessions cover all three. The long easy run comes first: keep it in zones 1 and 2, and build to 75–90 minutes.
- Threshold intervals (3 × 8 minutes at 8 out of 10) raise the pace you can sustain. They’re the main session of the build phase.
- 10K-pace reps (4 × 1 mile / 1.6km) teach you race pace. Hit the pace, don’t beat it.
- VO₂ max intervals (5 × 3 minutes at 9 out of 10) raise your ceiling. Add them last.
- The progression run (5 miles / 8km, finishing at threshold) teaches you to pace evenly and finish strong.
Run one or two hard sessions a week, never on back-to-back days, and keep everything else easy.
This article is general information, not medical or coaching advice. If you feel chest pain, dizziness or unusual breathlessness while running, stop and talk to a doctor.
References
- Joyner MJ, Coyle EF. Endurance exercise performance: the physiology of champions. The Journal of Physiology, 2008. doi.org
- Casado A, Hanley B, Santos-Concejero J, Ruiz-Pérez LM. World-class long-distance running performances are best predicted by volume of easy runs and deliberate practice of short-interval and tempo runs. Journal of Strength and Conditioning Research, 2021. doi.org
- Seiler S. What is best practice for training intensity and duration distribution in endurance athletes? International Journal of Sports Physiology and Performance, 2010. doi.org
- Faude O, Kindermann W, Meyer T. Lactate threshold concepts: how valid are they? Sports Medicine, 2009. doi.org
- Casado A, Foster C, Bakken M, Tjelta LI. Does lactate-guided threshold interval training within a high-volume low-intensity approach represent the “next step” in the evolution of distance running training? International Journal of Environmental Research and Public Health, 2023. doi.org
- Buchheit M, Laursen PB. High-intensity interval training, solutions to the programming puzzle. Part I: cardiopulmonary emphasis. Sports Medicine, 2013. doi.org
- Helgerud J, Høydal K, Wang E, et al. Aerobic high-intensity intervals improve VO2max more than moderate training. Medicine & Science in Sports & Exercise, 2007. doi.org
- Abbiss CR, Laursen PB. Describing and understanding pacing strategies during athletic competition. Sports Medicine, 2008. doi.org
