The Zone Underneath Zone 2 (And Why Zone 1 Matters)

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*Disclaimer*: This is all for general information and entertainment purposes only. I am not your doctor, nutritionist, dietician, physical/physio therapist, psychologist, personal AI, or any other medical professional. 

If you want to go further with this information, you should consult a medical professional, even for one session, to help sort out any specific needs that you may have.

Running is very individual, so experiment with everything I say and don’t take anything as hard truth for you, even if science backed.

Runners are funny. We drive a quarter mile for coffee, then take the elevator up to lift weights. We sit an hour in the car, eight at a desk, three on the couch. Then we wonder why our knees ache and why our 75-year-old self might not get off the toilet alone.

As runners we’re obsessed with training the right zones. But we sit 160 hours a week and run for 2, 3, maybe even 5 hours if you’re hardcore… but that math is not mathing.

There’s one zone almost nobody’s running in consistently and it’s not just going to make us better runners. It’s the thing keeping us out of a wheelchair when we hit 70 years old.

Everyone’s pushing Zone 2 down our throats: Huberman, Rhonda Patrick, Iñigo San Millán and yes, I have said zone 2 is the way many times over the last 12 years.

Yes, Zone 2 gets all the attention. What about Zone 1 though?!

Listen to audio podcast below on your next run or watch the video above to learn more

What You’ll Learn

  • Why Zone 2 gets all the attention. And what it’s actually good for.
  • Why Zone 1 is technically better than Zone 2, for some. And who it’s not good for.
  • How to micro-dose Zone 1 into your daily life for more than just running gains

How I Found Zone 1 By Accident

I’ve been running for almost 30 years. I stumbled into Zone 1 training by accident. I was training for an Ironman triathlon and had to run and bike commute to work and everywhere else just to fit the training in.

I was pushing my kid in a stroller, stopping at lights, and sometimes walked the hills because I had to.

The whole time I thought I was wasting my time and it wasn’t real training. I was so focused on Zone 2 that I figured all this Zone 1 commuting was junk.

Then I finished the Ironman in 10 hours and 50 minutes.

And over the years I researched, talked to experts and realized it was this accidental Zone 1 work that was holding the whole thing up. I haven’t stopped run-commuting since.

And I want to be clear up front. This isn’t a “Zone 2 is dead” hot take. I love zone 2 training more than anything else. This is way more nuanced than the internet wants to make it.

For some runners, lots of Zone 1 is a superpower; for others it’s a time-waster. But most runners can benefit from a little more zone 1 training as the payoff goes way beyond running.

Why Zone 2 Gets All The Attention

Alright – so first, what is Zone 2 training?

Zone 2 is the “you can hold a full conversation and say a lot of words without taking a breath” zone. This is based on a 5 heart rate zone system. For most it’s between 60-80% of your max heart rate. The easy stuff. The base. The miles you stack to build your aerobic engine.

It’s not new. Dr. Phil Maffetone put low heart rate training on the map back in the late 90s with his MAF method; run slow to run fast, and it built a cult following with endurance athletes who actually saw the results. Hell, I drank and preached the zone 2 kool aid since 2013 (and I still do!)

But it went truly mainstream around 2021. Iñigo San Millán, a researcher at the University of Colorado, was publishing on Zone 2 driving mitochondrial growth. He also happens to coach Tadej Pogačar, the cyclist who’s been winning Tour de Frances since 2020. The pitch was simple: train Zone 2, build more mitochondria, live longer, race faster.

Then Garmin and Apple Watch built zones right into the watch face so your heart rate zone is glowing at you every second of every run. Now your dentist is talking about mitochondria

And look. They’re not wrong. Zone 2 IS great for building aerobic capacity.

Check this though.

Most runners can’t actually stay in Zone 2 while running. They drift into Zone 3. The “easy” run isn’t easy anymore. It’s gray zone work. Not hard enough to build top-end fitness. Not easy enough to recover from. You’re paying the cost without getting the reward.

Quick action that’s really a challenge. On your next run try running slow, keeping your hr in zone 1 and maintaining good form without walking. Way harder than you think. The key for me is to shorten my steps, make sure I’m driving my knees up (as high as I practically can). Do 1 min on running super slow with good form then 4 mins running normal on a flat course. Then the next week 2 min, on 4 mins off. Get up to 5 mins on and you might see some decent gains.

“The strongest runners often spend most of their training going painfully slow.”

Why Zone 1 Is Better (But Most People Can’t Do It)

Zone 1. Roughly 50 to 60 percent of max heart rate. Walking pace. Super easy shuffle. The kind of effort where your watch buzzes at you to speed up and you ignore it.

Iñaki de la Parra, the 2016 Ultraman World Champion with a VO2 max over 70, does 80 to 90 percent of his training in this zone. Yes zone 1!!

Mike Trees, who came on my podcast last year, is 62 years old, runs a 17-minute 5K, and runs 4 minutes 30 per kilometer at heart rate 105 to 110. He calls himself an aerobic monster. And he got there by doing thousands of hours of low Zone 2 and Zone 1 work.

Here’s my take after 30 years of running and looking at the research. Zone 1 gives you most of the same AEROBIC BASE adaptations you’d get from Zone 2; more mitochondria, more capillaries, better fat burning, bigger aerobic engine, but at a fraction of the recovery cost. You can stack way more hours of it without breaking. That’s the unlock. Same foundation, less damage.

To be clear, Zone 1 will NOT build your threshold or your VO2 max the way Zone 3, 4, and 5 work will. That’s a different job. Zone 1 builds the basement. The intervals build the top floor

Strava just rolled out a feature where you can see your zone distribution over weeks, months, and the year and I actually just realized that I train Zone 1 and Zone 2 about 90 percent of the time now. It’s wild to look at but it took me years to get this profile.

Here’s the science of why it works.

A 2014 study by Stöggl and Sperlich, published in Frontiers in Physiology, compared four training models in endurance athletes. Polarized training, which is roughly 80 percent easy work and 20 percent hard work, beat threshold-heavy training, high-volume training, and HIIT-only training for both VO2 max and time-to-exhaustion gains.

Matt Fitzgerald wrote a whole book about this called 80/20 Running. Pick it up if you want the deeper dive.

So Zone 1 is the foundation. Think of it like scaffolding around a building. Zone 1 doesn’t make the building taller. It’s what lets you keep adding floors without the whole thing collapsing.

But here’s the nuance YouTube hot takes always miss.

Zone 1 only works if you have the volume to compound it. Iñaki, Mike Trees and even myself when I was training for my ironman, were running, riding and swimming 10, 15, and 20 or more hours a week. That’s why Zone 1 builds them up. They have the time to stack it.

If you’re running three days a week for 30 to 45 minutes, this isn’t your move. You don’t have the volume for Zone 1 to compound.

A 2007 study by Helgerud and colleagues found that high-intensity intervals built VO2 max significantly faster than steady-state moderate training in well-trained runners with limited volume.

So who is Zone 1 actually for? The marathoner training seven days a week whose easy zone 2 run days are still too fast and it’s wrecking their body and not allowing them to train correctly on the hard and long days. And zone 1 is also for the Ironman training triathlete commuting to work who can stack hours.

And it’s for the runner whose ego won’t let them walk on a recovery jog because they just aren’t fit enough to be able to run in zone 2.

If that’s you, slowing down is the unlock.

If you run three times a week training for a fun 5K, keep your intervals. Don’t let me talk you out of intensity. But you can also have one zone 1 run every 10-14 days in your toolkit to whip out for a proper easy recovery run.

Quick action. If you have Strava Premium, pull up the new zone distribution feature and look at the last month of your training. Be brutally honest about what you see. If you’re sitting 60 percent in Zones 3 and 4 thinking you’re doing “easy” running, that’s the problem.

Here’s the real issue: it’s not your training plan. It’s what happens in the other 23 hours.

Your Real Problem Isn’t Training. It’s Your Life

Even if we nailed Zone 1, even if we had perfect intervals, and even if our long runs were textbook… there’s a bigger problem sitting in the way of us living a strong life into our 70s and 80s.

It has little to do with how you train but more in how you live.

We train 5 hours a week. We sit the other 163.

The coffee run is still 400 meters. The elevator is still right there. The car is still parked outside.

None of that has changed since the intro of this video. What’s changed is what you know now.

Now you know that every elevator ride is a 30-second deposit into a body that can’t hold itself up in 30 years. Every coffee drive is a missed walk. Every hour in the car is an hour your hips forgot how to move.

The math still ain’t mathing.

A 2004 scientific review laid out the science that should bother you.

After age 30, you lose 3 to 8 percent of your muscle mass per decade if you’re not actively training against it. After 60, that accelerates. Falls become one of the leading causes of injury-related death in older adults. Not cancer. Not heart attacks. Falls. From weakness. From not moving.

That’s a slow leak in your tire. You don’t notice it driving to work. You notice it when you need to swerve.

Modern medicine has gotten really good at keeping us alive. It has NOT gotten good at keeping us capable. So we don’t die early. We spend the last 20 years of our life in a body that can’t carry us.

If you don’t use it, you’ll lose it.

And the fix isn’t another training plan. The fix is learning to weave Zone 1 movement back into the 160 hours a week that aren’t training.

“The body breaks down faster from sitting all day than missing one workout.”

How to Micro-Dose Zone 1 Into Your Day

Stop separating “training” from “moving.” Movement IS your Zone 1.

Some people like Pavel Tsatsouline call this greasing the groove. Brady Holmer calls this fitness snacks. I call it micro dosing.

It’s just small frequent activities of low-intensity work spread across the day instead of one big workout. You’re not chasing a training adaptation. You’re chasing a baseline. You’re stopping the leak.

Walk to the coffee shop. Take the stairs every single time. Park at the back of the lot. Get a kettlebell, put it next to your desk, do one set of swings every hour. Not a workout. Just movement.

Sprint up the stairs for 20 seconds in the middle of the day to break up the sitting. Walk after every meal.

Now here’s the part you have to be clear on.

Daily movement is not training. It’s not going to make you a faster 5K runner on its own. It’s not going to build mitochondria the way a 90-minute steady low heart rate run will.

But daily movement IS the difference between aging strong and aging fragile. And it’s free.

Here’s the stack you actually want.

Structured training builds your aerobic ceiling. Your race pace, your engine, your top-end fitness.

Daily Zone 1 movement builds your longevity floor. The strong, capable body that’s still here at 75.

You need both.

Quick action. If running in Zone 1 is hard (it is for most runners), do your Zone 1 work cross training. Like on the bike, in the pool, or on the elliptical. I’ve found it’s much easier to keep your heart rate low. And on hilly runs, be ok with walking the climbs to keep your hr low.

Now here’s the bridge: once you stop treating Zone 1 as “training you do only on runs” and start treating it as “movement you can stack all day,” the easiest place I’ve found to begin is the commuting you already have to do to get to places each day.

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