How 10K intervals are built
A 10K interval session improves three things: tolerating race pace, holding it for longer and running it at lower cost. Each phase of the plan focuses on one of them. Intervals do not start at race pace. They get there by two routes: extending the effort from a slower pace and shortening the repetition from a faster pace.
The paces in this guide start from a 40:00 10K, which is 4:00/km at 100%. Get other times from the calculator.
General phase: speed and mechanics
The first weeks carry short, fast repetitions with plenty of recovery. They are not strict 10K intervals. They prepare you for the later ones.
- 10 x 300 m at 110% (1:05 each) with 2 min walking or jogging recovery.
- 8 x 400 m at 105% (1:31) with 2 min.
- Fartlek: 10 x 1 min at 100-105% with 1 min easy.
- Hill sprints of 8-10 s at maximum effort, 6 to 8 repetitions, walking back down.
Run loose here. If the last repetitions come out slower than the first, you recovered too little.
Special phase: the two extremes
Volume keeps rising, and the sessions split into two types.
Slow side (continuous runs at 90%). 8 to 12 km at 90% (4:24/km), with warm-up and cool-down. This work extends endurance.
Fast side (repetitions at 105%). Repetitions of 400 to 600 m with long recovery:
- 8 x 400 m at 105% (1:31), 90 s recovery.
- 6 x 600 m at 105% (2:17), 2 min recovery.
- 5 x 800 m at 103% (3:06), 2:30 recovery.
Keep the two types in separate sessions. One day of each per week gives you both stimuli without stacking them.
Specific phase: race pace
The intervals move to 100-103% and grow by extension: more repetitions, longer repetitions and shorter recoveries. One possible progression for an intermediate runner, from first session to last:
- 8 x 1000 m at 100% (4:00), 2:00 recovery jogging 400 m. Total work: 8 km.
- 12 x 600 m at 101-102% (2:21-2:23), 90 s recovery. Work: 7.2 km.
- 10 x 1000 m at 101% (3:58), 90 s recovery. Work: 10 km.
- 4 x 2000 m at 101% (7:55), 3 min recovery. Work: 8 km.
- 3000 m + 2 x 2000 m at 100% / 101% / 102%, with 3-4 min between blocks. Work: 7 km. This is the biggest session, 3 to 4 weeks before the race.
- 5 x 1000 m at 101-103%, 2 min recovery. Final session, 10-14 days before.
Two principles guide this sequence:
- Lengthen before you speed up. Go from 1000 m to 2000 m at similar paces before you run faster 1000s.
- Shorten the recovery or lengthen the repetition, never both. If you change both variables, you cannot tell which one made you fail.
The total work in a specific session runs around 8 to 12 km. Above 12 km, the extra fatigue costs more than it gives.
Paces for a 40:00 10K
| Repetition | Percentage | Pace/km | Repetition time |
|---|---|---|---|
| 300 m | 110% | 3:36 | 1:05 |
| 400 m | 105% | 3:48 | 1:31 |
| 600 m | 102% | 3:55 | 2:21 |
| 1000 m | 101% | 3:58 | 3:58 |
| 1000 m | 100% | 4:00 | 4:00 |
| 2000 m | 100% | 4:00 | 8:00 |
How to recover between repetitions
Match the recovery to the goal of the session.
- Short repetitions (200-400 m): 1:30 to 2 min walking or very easy jogging. The goal is to repeat the quality.
- 1000 m repetitions: 90 s to 2 min jogging, about 300-400 m. If the set has 8 or more repetitions, shorten the pause over the weeks.
- Repetitions of 2000 m or more: 3 to 4 min. Jog easy instead of stopping.
If you cannot hold pace in the last two repetitions, do not compensate with more rest in that session. Note the result and lower the percentage by 1% next time.
Common mistakes in 10K intervals
Starting too fast. A first repetition at 104% in a set planned at 101% costs you on the sixth. Time the first 200 m and back off if you are more than 2 s ahead of target.
Shortening the recovery and lengthening the repetition in the same week. Each change needs a session to settle. Change both at once and you cannot tell which one broke the set.
Running intervals in every quality session. A 10K plan also includes continuous runs at 90-95% and long fast runs. Intervals are one session type among three.
Skipping a measured course. 1000 m repetitions are easier to control on a track or a measured stretch. In a hilly park, keep the effort and stop chasing the pace.
Treating hill sprints as filler. The short hills of the general phase build strength and speed without the impact of fast running on flat ground.
Putting it together
A four-week block of the specific phase for the 4:00/km runner could look like this. Week 1: 8 x 1000 m at 100% and a 15 km long fast run at 87.5%. Week 2: 12 x 600 m at 101-102% and a 12 km continuous run at 90%. Week 3: 10 x 1000 m at 101% and an 8 km continuous run at 95% (4:12). Week 4: 4 x 2000 m at 101% and a 12 km continuous run at 90%. Each week holds two key sessions, and every other day is an easy run of 8 to 12 km or a rest day.
Between sessions
Leave 2 to 3 easy days after each specific session. Run no more than two key sessions per week: one at race pace and one for endurance or a long fast run. Add 4 to 6 strides on an easy day, best on the second easy day after a session.
To see the sessions with your own paces, create your plan from the home page.
Frequently asked questions
How many kilometers of intervals do I need for a 10K?
In the specific session, between 8 and 12 km at race pace or a little faster. An intermediate runner stays at 8-10 km and an advanced runner reaches 12 km. More does not improve the 10K and adds fatigue.
How much should I recover between 1000 m repetitions?
Between 90 s and 2 min jogging at the start of the specific phase, and 3 min or more when the repetitions move up to 2000 m. Shorten the recovery or lengthen the repetition, but not both in the same session.
What pace should 10K intervals run at?
Between 100% and 103% of 10K pace, depending on the phase. A 40:00 result means 4:00/km at 100% and 3:53/km at 103%. Long repetitions (2000 m) sit closer to 100%; short ones sit closer to 103%.
When do I run the last long interval session before the race?
Between 10 and 14 days before. After that, volume drops and short sessions at race pace remain.