What pace is a sub-20 5K?

6:26 per mile or 4:00 per kilometre exactly. The clean kilometre split is one of the reasons this barrier is so popular.

How many miles a week to break 20 minutes?

30 to 40 is the productive range. It is done on 20, but runners stuck just over 20 minutes are almost always short on aerobic volume rather than on speed.

How long does it take to go from 21 minutes to sub-20?

Eight to sixteen weeks for most runners, if the change is more easy volume plus one weekly threshold session. Longer if you keep doing what got you to 21.

Do I need to run on a track?

No. Intervals by time on any measured stretch work fine. A track makes pacing easier to learn, which is worth something early on.

Train for

Breaking 20 minutes for 5K

Twenty minutes for 5K is the barrier that separates runners who run from runners who train. It is 6:26 per mile, or a clean 4:00 per kilometre, and it asks for more aerobic depth than most people expect from a twenty minute race.

The pace

Split	Time	Per mile	Per km
1 km	4:00	6:26	4:00
1 mile	6:26	6:26	4:00
3 km	12:00	6:26	4:00
5 km	19:59	6:26	4:00

Why more intervals is usually the wrong answer

The runner stuck at 20:20 almost always responds by doing more 400s. It rarely works, because the thing limiting them is not their ability to run fast for 90 seconds. It is how much of their VO2max they can hold for twenty minutes.

That is an aerobic property, and it is built by running more, mostly easily. A runner doing 25 miles a week with three interval sessions is capped in a way that a runner doing 40 miles a week with one interval session and one threshold session is not.

The uncomfortable prescription for most people stuck just over 20 is: add ten easy miles a week and remove an interval session. It feels like going backwards for about five weeks.

The sessions

VO2max intervals, weekly. 5 x 1000m at goal pace with 2 to 3 minutes jog, or 6 x 800m slightly faster. Total hard running of 4 to 5km. This is the specific work and it needs to be sharp, not endless.
Threshold, weekly. 20 to 25 minutes at roughly 6:55 to 7:05 per mile. Raises the fraction of your ceiling you can sustain, which is exactly what a 5K asks for.
Long run. 8 to 12 miles easy. It feels irrelevant to a 5K and it is not. It is where the aerobic base that supports everything else gets built.
Strides. 6 to 8 x 20 seconds, twice a week after easy runs. Cheap turnover maintenance that keeps 6:26 from feeling foreign.

Racing it

The 5K is unforgiving of a fast start in a way that longer races are not, because there is no time to recover from it. Go through the first kilometre at 4:00 to 4:02, not 3:52.

The second kilometre is where sub-20 attempts are decided. It is the least motivating part of the race, no longer fresh and not yet close to the end. Hold 4:00 there and the last kilometre takes care of itself.

Frequently asked

What pace is a sub-20 5K?: 6:26 per mile or 4:00 per kilometre exactly. The clean kilometre split is one of the reasons this barrier is so popular.
How many miles a week to break 20 minutes?: 30 to 40 is the productive range. It is done on 20, but runners stuck just over 20 minutes are almost always short on aerobic volume rather than on speed.
How long does it take to go from 21 minutes to sub-20?: Eight to sixteen weeks for most runners, if the change is more easy volume plus one weekly threshold session. Longer if you keep doing what got you to 21.
Do I need to run on a track?: No. Intervals by time on any measured stretch work fine. A track makes pacing easier to learn, which is worth something early on.

Your block, written

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Shed takes your goal, your race date, and the days you can actually run, then writes every session between here and the start line. It reads each run off your Apple Watch the same day and moves what needs moving. No spreadsheet, no guessing at paces.

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