Slow Is the Strategy
Most runners are training too hard on easy days, and it's why nothing is changing
If there’s at least one thing all runners have in common, it’s the desire to get faster.
So when a runner comes to me logging 20 to 30 miles a week with a pace that hasn't moved in months, the first thing I look at isn't their hard days. It's their easy ones.
Most of the time, every run is sitting in the same zone, above base-building intensity, below threshold. Working hard enough to be tired every day, but not hard enough to improve the foundation.
The problem is almost always their easy training pace.
Most runners I talk to are doing the same thing without knowing it.
The Culture That Made You Speed Up
Running culture is built on comparison. Every platform, every group run, every race recap reinforces the same standard - only the runner pushing hardest is the one doing it right.
The runner who pushes every session and suffers visibly is held up as the serious one. The runner shuffling along at a conversational pace, heart rate low, looking almost bored, is seen as either a beginner or not trying hard enough.
Strava turned every run into a public performance. So did every running influencer posting their suffer-face tempo runs as 'easy' efforts. Group runs can do the same, the moment you're chasing faster athletes.
The message from everything around you is that effort equals progress, and anything that doesn't feel hard isn't doing anything impressive for you as a runner.
So runners speed up on days they shouldn't. Just enough to feel productive without embarrassment. And that's exactly where the returns on training break down.
Why Consistent Moderate Training Stops Producing Results
The runner training at higher effort on easy days is consistently training in the wrong zone, and the consequences are specific.
Moderate effort sits above the intensity where aerobic base adaptations happen and below the intensity where performance adaptations happen. It's not building your engine, and it's not sharpening your speed.
It's just accumulating fatigue.
It's the zone that feels the most natural to most runners, which is exactly why so many runners live there. And the fatigue it builds caps what hard days can produce. The body never fully recovers between sessions, so when a hard day arrives, there's nothing to give.
The workouts still happen, but there’s no change in fitness. Months pass, miles accumulate, and the pace stays the same. The runner thinks they need to train even harder, when the actual problem was that they never trained easy enough to make hard efforts mean anything.
Aerobic Base Doesn't Build at Moderate Intensity
One of the hardest things for runners to accept is that you get faster by training slower. It just feels contradictory.
But when you work at low intensity - Zone 2, conversational effort, the pace that feels almost too slow, your body builds the engine that aerobic performance runs on.
Mitochondrial density increases in muscle cells, expanding aerobic work capacity at the cellular level. New capillaries form in active muscle tissue, improving oxygen delivery. Blood plasma volume expands, increasing stroke volume and cardiac output.
These adaptations aren’t triggered at the same level by moderate effort. They're specifically considered low-intensity adaptations. This makes low-intensity training largely a prerequisite to high-intensity training having any lasting effect on performance.
Swapping endurance volume for intensity isn't a shortcut when you don't have a foundation first.
I learned this about three years into running. I was running my easy days at around 9:30 per mile because my 5k pace was around 8:45, and I figured training closer to race speed would make me faster. It felt productive even though I wasn't seeing any changes. It was also draining me every single run.
When I properly tested my zones and tried to run at actual Zone 2 intensity, my pace dropped to around 13:00 per mile. I was shuffling barely above a walk. The first time I ran that pace on the streets, other runners were shooting past me like I was standing still. It felt pretty embarrassing, but I kept going anyway. A few weeks later, I was closer to an 11:00 pace at the same heart rate.
Nowadays, depending on my training cycle, my easy pace sits between 9:30 and 10:30. The embarrassing shuffle was the work at the beginning. Now it's just a normal run.
Every athlete I work with starts with the same foundational work. And they all hate it at first. The effort feels too easy, and it's hard to believe anything useful is happening.
But after a few weeks, the same routes start feeling faster at the easy effort. The pace picks up without the heart rate following. That's the base building.
Your Easy Pace Is Probably Too Fast
Easy pace for most runners is slower than they think. Often by two or more minutes per mile compared to race pace.
Heart rate zones are the framework coaches use to define training intensity. Zone 1 is active but easy, like a walk or very light jogging, while Zone 5 is for harder intervals and all-out efforts.
Zone 2 is considered the base-building zone. It’s low enough intensity that your body can trigger the aerobic adaptations that move your foundational fitness forward. Zone 2 sits below what most people consider a "real" workout pace, before they start focusing on it as purposeful training.
There are two ways to find your Zone 2. The most accurate is a heart rate monitor paired with a proper zone test - a 20-minute maximum effort that anchors all your training zones. If you have a monitor and want the precision, that's the best option.
But the talk test works for anyone. Run at a pace where you can hold a full conversation without any effort. Not a few words between gasps, but full sentences with normal breathing.
If you're working to speak, you're already above Zone 2. Slow down until the conversation feels completely effortless.
One thing worth knowing early on is that if you're new to Zone 2 training, your heart rate will fluctuate more than you expect. Small hills, uneven terrain, and even the act of talking, can spike it until you've built the foundation. That's normal. The goal isn't a perfect flatline; it's learning to bring the effort back down when it drifts.
Most runners are surprised by how slow their easy pace actually is. At first.
The more you train Zone 2, the more that shuffle turns back into a run, at a heart rate that's doing something productive.
Slow Down to Train Your Base
Your next easy run has one rule. If you can't hold a full conversation, slow down.
The pace will feel wrong. It will feel slow. If you're with other people, you may need to let them go ahead of you. That's expected. The run that looks the least serious is doing the most foundational work.
During the run, your breathing should be fully controlled. You should be capable of full sentences without effort. If you're working to breathe, slow down. Especially on hills.
At the end of your run, you should feel like you could have kept going a lot longer. You're not out of breath or drained. That's what easy is supposed to feel like.
Over weeks, you'll notice a shift. The pace that felt embarrassingly slow starts to rise to a more normal run pace, while still feeling easy. You find yourself moving faster with the same effort. That's the base building.
The easy run that looks like nothing is building everything.
When you first commit to Zone 2 training, it will feel off, and every runner who blows past you will look more committed than you do.
But the runners who have been doing this long enough know exactly what they're looking at. That's not a beginner shuffle. That's someone who understands what the foundational work looks like before it shows up in their pace.
What would change if you let your easy runs be easy?