
I want you to do a quick test.
Go run for two minutes at a pace where you’re breathing hard but could still speak a few words at a time. Not full sentences. Just a few words.
That uncomfortable in-between feeling, not easy, not hard, that’s the grey zone.
And if you’ve listened to me before, you’ve probably heard me say to avoid it. I said that in a previous episode. I told people it was bad. I told people to stay away from it.
But here’s what I’ve learned since then.
The grey zone itself isn’t the enemy. Accidentally running there all the time is.
Most advice about the grey zone is either way too complicated or completely vague. So I want to simplify this. I’m going to give you three simple ideas that clear up the confusion and show you how to use the grey zone properly, without sabotaging your training.
Listen to audio podcast below on your next run or watch the video above to learn more
What Is Grey Zone and How to Spot It
Imagine a light switch that is jammed right in the center. When you flip the switch all the way up, the light turns on. When it’s all the way down, it rests. But when it’s stuck in the middle? The bulb just flickers. It’s technically working, but it’s not working well.
That is exactly what your body is doing in the grey zone.
The Physiology of the “Flicker”
When you are stuck in this middle ground, a few specific things are happening internally:
- Heart Rate: You are hovering roughly between 78% and 87% of your maximum heart rate.
- Breathing: You are huffing too much to have a normal chat, but you aren’t gassed enough to stop.
- Waste Clearance: Your body is struggling to clear lactate fast enough, which eventually leads to that familiar burning sensation.
- Fuel Source: You are burning through your sugar (glycogen) stores rather than utilizing fat.
The result? You are tiring yourself out too much to recover quickly, yet you aren’t pushing hard enough to trigger the physiological adaptations that make you faster.
The Simple Test
You don’t need a lab to figure this out. You can use the “Talk Test” right now:
- Easy Zone: You can speak in full sentences before needing a breath. This is where you want to be for 80% of your running.
- Hard Zone: You can only grunt out single words. This is also good.
- Grey Zone: You can speak a short sentence, but it’s uncomfortable, and you feel like you’d have to tap out in about 20 minutes. That’s like 10K racing, or if you do a 25 or 30 minute 5K, that’s usually the grey zone.
The Trap
The biggest mistake runners make is assuming that grey zone is a specific speed. Grey zone isn’t ONE pace. It’s different for everyone. An 11-minute mile (about 8 minutes/km pace) might be grey zone for a beginner, 25-30 minute 5K runner.
A 7-minute mile (about 4 minutes/km; 4:10/km) might still be easy for someone who’s been running for years and runs a 2:50 to 3-hour marathon.
This is why those “run at 9:30 pace” training plans (where it’s pace-only training plans and distance-only) fail. They don’t know YOUR body, your needs, your experience and what your goals are, etc.
Action Step: Monitor your next three easy runs. If you cannot hold a conversation the entire time, you are accidentally slipping into the grey zone. Slow down.
“The grey zone isn’t the enemy. Running in it by accident is.”
Why People Call It “Junk” (And Why That’s Wrong)
Think of your body like a battery.
- Easy running charges your battery slowly and fully. Think of it like just boop; it’s just gonna get a quick top-up. You recover, build your base, and get more efficient.
- Hard running drains your battery Fast. That’s when you build speed and power. The drain forces your battery to upgrade its capacity.
- Grey zone drains your battery but doesn’t trigger the upgrade. So you don’t get that little turbo boost. You’re working hard enough to stay tired but not hard enough to force your body to adapt.
This is where most runners live. Every run feels medium. They’re never fresh. Never truly fast. Just grinding.
Grey Zone Work Is a Tool
Grey zone work isn’t junk when you use it on purpose. It’s a tool, a very specific tool. It’s like that special knife in your kitchen that you have for that one thing, or that random pot, or that thing that you bust out when you have this super fancy meal. You don’t use it that much, but it’s a tool.
Marathon pace? Ironically, grey zone for most people, or at least it will turn into it. Even half marathon can be grey zone for people.
Tempo runs? Grey zone.
Long runs where you speed up at the end? Progressive long runs? Grey zone.
Threshold running (that’s actually tempo runs)? That’s grey zone.
The problem isn’t the zone itself. It’s when grey zone becomes your default instead of your tool.
If 80% of your runs are still easy and conversational, grey zone work has a place. You’re using it as a tool to prepare for race pace or build your threshold, which you need for 5K, 10K, and half marathon work (if you’re a fast half marathoner).
But if ALL your runs are actually in the grey zone? You’re constantly half-drained. Never recovering, never improving.
“Grey zone is a tool. Tools work when you know what job needs doing.”
The Framework
This is the simple framework I come back to over and over, because it works.
About 80% of weekly mileage should stay easy. Easy means you can talk freely. You can say full sentences, take a breath, and keep going. Effort-wise, that usually sits around a 3-4/10, living in zone one and zone two. This is where your base is built and where recovery actually happens.
The remaining 20% is where the work belongs. This is hard running or planned gray zone work. That includes race pace efforts, tempo runs, and intervals. It’s not “destroy yourself” hard and it’s not racing every workout. It’s simply hard enough to send a clear signal to your body.
That 20% can include VO₂ max work, higher zone three, or zone four efforts. Tempo runs fit here. Repeated hard efforts fit here. The faster finish of a long run fits here. Racing itself often lands in the gray zone, and that’s completely fine when it’s intentional.
The key is contrast. Easy stays easy. Hard has a purpose. Gray zone works when it’s used as part of that structure, not when it quietly takes over everything.
When to Use (And Avoid) Grey Zone

Grey zone is a tool. Tools work when you know what job needs doing.
USE Grey Zone When:
- Training for a half or full marathon (race pace work is grey zone)
- Building your threshold (tempo runs, cruise intervals)
- Doing progression runs (starting easy, finishing moderate)
- You need aerobic work but can’t handle high mileage yet.
The grey zone can be a tool, especially for people that run three days a week.
AVOID Grey Zone When:
- You’re building your base (just run easy, build capacity). It’s fine.
- You’re recovering from injury or burnout. If any grey zone work happens at all, it should be very, very little; maybe 5 to 10 minutes a week.
- It’s supposed to be an easy day. Don’t let ego ruin recovery. Easy should stay easy. That said, touching the grey zone briefly at the end is fine. The last 2–3 minutes of a shorter run, or the final 5–10 minutes of a long run, can dip into low zone three once in a while. The key is that you’re in and out quickly. You’re not sitting there for 20, 30, or 60 minutes.
- You’re running with faster friends. You join a new group, the pace is slightly quicker, and you still want to talk, so your “easy” run slowly drifts out of the easy zone. That’s how grey zone sneaks in without you noticing. It might take a few weeks or months, but that constant drift will burn you out.
Think of it like lifting weights. You don’t curl 20-pound or 20-kilo dumbbells for an hour every day. It feels easy at first, then you wear yourself down or get hurt. You either lift heavy for short bursts or move light for volume. Training needs contrast: easy and hard, effort and recovery, not medium all the time. Medium once in a while is fine. Living there isn’t.
Here’s How To Check Yourself
- Track your easy runs. Use the talk test. If you can’t chat comfortably for 7 to 10 words at a time and then take a breath, you’re not in the easy zone.
- Track your hard days. Ask yourself if you’re actually going hard. That means true 7or 8/10 efforts on intervals that you can repeat over and over. Not 9/10. Not 10/10. And not medium-hard (5 or 6.5/10) for entire runs.
- Be honest about your goal. Marathon training uses more grey zone. Half marathon training does too. Ten-K needs some. A five-K usually needs less, depending on speed and the plan you’re following. Base building needs almost none. When you’re in a base phase, grey zone work should be minimal. You need the base first. Grey zone comes after.
Links & Learnings
- 📈 Get your free avoid the grey zone training plan here https://dlakecreates.com/subthresholdfree
- 🎧 Listen, read and learn more here https://dlakecreates.com/grayzonesimple
- Learn more about the Grey Zone here – https://dlakecreates.com/greyzone
- Run far and longer with ease here – https://dlakecreates.com/base
- Instagram – https://instagram.com/dlakecreates
- Strava – https://www.strava.com/athletes/120507


