If you’ve been running parkrun for a while, you’ve probably experienced the excitement of those early improvements.
You start running regularly.
You learn how to pace yourself.
Your fitness improves.
Personal bests arrive frequently.
A 28-minute parkrun becomes a 26-minute parkrun.
A 26-minute parkrun becomes a 24-minute parkrun.
Everything seems to be working.
Then something changes.
The improvements slow down.
The personal bests become harder to achieve.
You run 22:30.
Then 22:15.
Then 22:08.
Then 22:04.
And suddenly it feels like you’re working harder than ever for only a few seconds of improvement.
If that sounds familiar, you’re not alone.
The 20- to 25-minute range is where many runners experience their first significant plateau.
The good news?
A plateau doesn’t mean you’ve reached your limit.
It usually means your training needs to evolve.
The Beginner Gains Have Run Their Course
When someone first starts running, almost anything works.
Simply running consistently improves:
- Aerobic fitness
- Running economy
- Confidence
- Muscular endurance
The body adapts quickly because the stimulus is new.
That’s why new runners often improve dramatically during their first year.
But those easy gains don’t continue forever.
Eventually your body becomes accustomed to the training you’re doing.
The same runs that once produced large improvements now simply maintain your current fitness.
This is where many runners become frustrated.
They keep doing what worked before and wonder why progress has stalled.
The answer is simple.
The training that got you here may not be the training that gets you there.
You’re Exercising, Not Training
This is often the biggest difference between runners who plateau and runners who continue improving.
Many runners exercise.
Fewer runners train.
What’s the difference?
Exercise is about completing a workout.
Training is about progressing towards a goal.
Exercise might be:
- Running three times per week
- Running the same routes
- Running at roughly the same effort
Training involves:
- Purpose
- Structure
- Progression
The further you move towards the pointy end of parkrun performance, the more important that distinction becomes.
You’re Running Every Run At The Same Effort
Many runners become trapped in what I call the “grey zone“.
Their easy runs are too hard.
Their hard runs aren’t hard enough.
Every run ends up feeling moderately difficult.
The problem is that moderate training rarely produces exceptional results.
Successful runners tend to separate their efforts.
Easy runs are genuinely easy.
Quality sessions are appropriately challenging.
The contrast between hard and easy allows adaptation to occur.
Without recovery, improvement becomes difficult.
You’re Missing The Aerobic Foundation
One of the biggest surprises for runners chasing faster 5km times is discovering how important aerobic fitness remains.
A 5km might feel short.
Physiologically, it’s still heavily dependent on aerobic energy production.
The stronger your aerobic system becomes, the easier it is to sustain faster paces.
That’s why many successful runners continue to include:
- Easy runs
- Long runs
- Recovery runs
Even when their goal race lasts less than 20 minutes.
The engine still matters.
You’re Avoiding Threshold Training
If there is one type of workout that frequently helps runners break through a plateau, it’s threshold training.
Threshold running sits in that uncomfortable space between easy and flat-out.
It’s challenging but sustainable.
Examples include:
- 3 x 8min
- 4 x 6min
- 20min continuous
Threshold training improves your ability to maintain a stronger pace without accumulating excessive fatigue.
For many runners stuck between 20 and 25 minutes, it’s the missing ingredient.
You’re Racing More Than You’re Training
parkrun is fantastic.
The atmosphere.
The community.
The opportunity to test yourself every week.
But racing every Saturday can create a trap.
When every parkrun becomes a PB attempt, recovery can suffer.
Training quality can suffer.
Progress can stall.
Sometimes the fastest way forward is treating some parkruns as training rather than races.
Build fitness first.
Then express it.
You’re Closer Than You Think
One of the biggest mistakes runners make is assuming a plateau means they aren’t improving.
Often the improvements are still happening.
They’re simply smaller.
A runner moving from 24 minutes to 23 minutes has improved by 60 seconds.
A runner moving from 21 minutes to 20 minutes has also improved by 60 seconds.
The second improvement often requires far more patience and consistency.
The closer you get to your potential, the more valuable every second becomes.
That’s normal.
It’s also why the runners who continue improving are often the runners who trust the process.
What Should You Do Next?
If you’re currently stuck somewhere between 20 and 25 minutes, don’t assume you’ve reached your ceiling.
Instead, ask yourself:
- Do I have enough structure in my training?
- Am I developing my aerobic fitness?
- Am I including threshold work?
- Am I recovering properly?
- Am I training consistently?
Small improvements in these areas often produce meaningful improvements in performance.
And if your goal is to break 20 minutes, the first step is understanding where you currently stand.
Free Guide: The Sub-20 parkrun Blueprint
If you’re serious about running your fastest ever parkrun, download my free guide:
The Sub-20 parkrun Blueprint
Inside you’ll discover:
- The 5 habits shared by successful sub-20 parkrunners
- The 3 key workouts that improve 5km performance
- The Predictor Workout that reveals whether you’re within striking distance of breaking 20 minutes
- Common mistakes that keep runners stuck above the barrier
Most importantly, you’ll discover whether you’re closer to your goal than you think.
Download your free copy here:
https://qwikkiwicoaching.lpages.co/sub-20-parkrun-blueprint-nz
Not Sure If You’re Ready For Sub-20?
Start with the Blueprint.
The Predictor Workout inside the guide will help you assess your current fitness and identify the next step in your training journey.