Run · Lots of talk

Zone 2 / easy cardio

Also called easy miles · easy running · Zone 2 training · low intensity cardio · zone-2 · zone 2 cardio · easy cardio · conversational pace · mitochondrial cardio

Community talk. May contain inaccuracies. Not medical, training, or diet advice. Sharp pain, fainting, or disordered-eating concerns need a clinician.

Zone 2 is relatively easy aerobic exercise that can be sustained while carrying on a conversation. People use it to build an endurance base without making every workout exhausting. Training systems draw its boundaries differently, so there is no single heart-rate range that fits everyone.

Sitko et al. · 2025

Finding a sustainable aerobic pace

Walking or cycling can work. Choose an activity whose pace you can comfortably sustain. Walking speed, bike resistance and hills change the effort; the same setting can be easy for one person and hard for another.

CDC · 2025

Conversation is a rough effort check. Breathing deepens, but conversation continues. CDC describes moderate activity as being able to talk but not sing; only managing a few words suggests vigorous effort. This does not measure an exact Zone 2 boundary.

CDC · 2025

Zone systems draw different boundaries. Some coaches locate Zone 2 through breathing tests or blood lactate, a marker of exercise intensity. Five-zone models place it below the first marked change in these readings; three-zone models use Zone 2 for harder work.

Sitko et al. · 2025

60–70% is one watch definition. Garmin's Approach S70 chart uses 60–70% of maximum heart rate. That means a percentage, not beats per minute, and need not match a personally tested threshold.

Garmin · 2026

Short sessions still count. General adult guidance allows smaller bouts toward 150 moderate minutes a week, or 75 vigorous minutes, or a mix, plus strength work on two days. These targets are not specific to Zone 2.

CDC · 2023

Potential benefits

Aerobic fitness may improve. Low-intensity training can improve fitness, particularly in previously inactive people. Harder exercise can produce greater gains. Zone 2's claimed unique advantage for mitochondria—the cell's energy-producing structures—or using fat as fuel remains unproven.

Storoschuk et al. · 2025

Regular activity supports everyday health. Moderate-to-vigorous activity can improve sleep, reduce anxiety and lower blood pressure. Over time it lowers heart-disease and type 2 diabetes risk. These benefits belong to physical activity broadly.

CDC · 2026

Good to know

Easy exercise can still tire you. Heart rate and effort can rise during long sessions. Slowing down may help; fatigue alone does not reveal which zone someone trained in.

Sitko et al. · 2025

Fat-burning does not guarantee weight loss. Exercise uses energy, but weight changes also depend on food intake and overall energy balance.

CDC · 2026

Some medicines change heart-rate targets. Beta blockers slow the pulse. A clinician can help interpret exercise intensity; pushing harder to reach an ordinary watch range may be misleading.

American Heart Association · 2024

Stop for concerning symptoms. Chest discomfort, faintness or unusual breathlessness need medical attention; severe or persistent symptoms need urgent help. Known heart disease calls for clinician-guided exercise limits.

MedlinePlus · 2024

From community discussion

Easier stairs, little score change. One poster's stairs felt easier after nine months, while fitness rose modestly and resting pulse stayed unchanged. Their routine also included strength, intervals and yoga.

Community · Reddit/r/PeterAttia

Reported routines vary widely. Accounts describe 20–60-minute sessions, two to four days weekly. Weekly examples range from 90–180 minutes or more to three or four hours; some beginners describe two half-hour walks. These are examples, not targets.

Community

Slow running can feel awkward. A runner described an uncomfortable shuffle. Replies included improvement with run–walk breaks, but also little pace change despite valuing the energy left for faster sessions.

Community · Reddit/r/running

Watch settings changed one runner's experience. A Garmin poster could run continuously after switching to zones calculated from resting and maximum heart rate. The changed estimate was not an independent threshold test.

Community · Reddit/r/Garmin

Nose breathing and watch zones can disagree. In that discussion, two people could nose-breathe in higher watch zones, despite another reply suggesting it as a Zone 2 check.

Community · Reddit/r/Garmin

Boredom solutions are personal. One poster preferred reading on a bike after television failed to help. Others liked audiobooks, walking with friends or time without notifications.

Community · Reddit/r/PeterAttia

Some prefer bikes or indoor sessions. Accounts favor cycling or incline walking over slow jogging. Winter options include stationary bikes, self-paced Peloton, treadmills and easy rowing. Light loaded walks appear too; hills change the effort.

Community

Gradual additions fit around lifting. One four-week example goes from two 20-minute sessions, to two 30-minute sessions, to three, then holds. People fit these after lifting or on separate days, sometimes reducing harder work.

Community

Repeatability matters more than pace. Reports describe initially feeling too easy, then easier recovery between lifting sets and energy for tomorrow's lift. Others get heavy legs when stacking steps, new running and cardio; they monitor weekly minutes and recovery.

Community

Conditions change the pace. People report higher pulses with heat, poor sleep or caffeine and slow down on hills. A step total or fixed 12–3–30 treadmill setting does not establish their effort.

Community

Equipment is optional. Discussions include Maffetone's 180-minus-age heart-rate cap and lactate around 1.5–2.0 mmol/L—different reference points, not universal targets. Others begin with conversational walks or rides without a chest strap or lactate meter.

Community

Easy and hard sessions can coexist. Discussions question how much easy work fits into limited time. Some combine it with lifting and harder intervals, including Norwegian 4×4; others maintain an easy aerobic habit for years.

Community

Running slowly can feel awkward in company. One X runner described being passed around a track while keeping an easy effort. Other saved reports describe hiding the pace display to resist turning an easy run into a race. Neither embarrassment nor a fast pace measures whether the session helped.

Community · X

References for this topic

Sources and context

Official Q&A for Wednesday, February 18, 2026 ↗
id
fit-running-context — Official Q&A for Wednesday, February 18, 2026
platform
Reddit · r/running
role
Community discussion
accessed On
2026-09-07
locator
2026-02-18 pace-versus-heart-rate question and constrained-week long-run question.
scope
Opened the two question/reply chains.
limitations
Selected anecdotes, not coaching consensus; device algorithms and training-load claims were not verified.
What is Best Practice for Training Intensity and Duration Distribution in Endurance Athletes? ↗
id
fit-guide-easy-seiler-2010 — What is Best Practice for Training Intensity and Duration Distribution in Endurance Athletes?
platform
International Journal of Sports Physiology and Performance
role
Professional context
accessed On
2026-09-24
locator
Table 1 five-zone scale, the low-intensity definition under about 2 mmol, the Foster easy-day passage, and the 80 percent session passage
scope
Norwegian Olympic zone 2 at about 72 to 82 percent of maximum heart rate and 1.5 to 2.5 mmol, plus the three-zone easy line under about 2 mmol and the session split described in well-trained athletes
limitations
A 2010 review of competitive endurance athletes. It does not set a beginner's weekly minutes, and the PDF host is not the journal's own site. Heart-rate percents are not personal lactate tests.
slugs
- easy-miles
- polarized-training
- tempo-run
How to Measure Physical Activity Intensity ↗
id
fit-guide-easy-cdc-intensity — How to Measure Physical Activity Intensity
platform
CDC
role
Official context
accessed On
2026-09-24
locator
Relative intensity, the Talk Test tip, and the vigorous-activity examples; page updated December 4, 2025
scope
Talk-but-not-sing as moderate, a few words as vigorous, the 0-to-10 effort scale, and jogging listed as vigorous in absolute terms while relative effort can differ
limitations
Does not define Zone 2, a running pace, or an 80 percent training split.
slugs
- easy-miles
- hard-cardio-day
- polarized-training
- twelve-three-thirty
- hybrid-athlete
- norwegian-4x4
- fasted-cardio
Novice 1 Half Marathon Training Program ↗
id
fit-guide-easy-higdon-half-pace — Novice 1 Half Marathon Training Program
platform
Hal Higdon
role
Official context
accessed On
2026-09-24
locator
Pace paragraph in Hal on his Novice 1 Program
scope
Conversational pace for the regular workouts, with a stated heart-rate note of about 65 to 75 percent of maximum pulse for people using a monitor
limitations
One coach's note for his half-marathon plan. It is not a lab zone and not the Norwegian scale.
slugs
- easy-miles
- first-10k-half
- long-run
What Is Zone 2 Training?: Experts' Viewpoint on Definition, Training Methods, and Expected Adaptations ↗
id
self25-zone-2-expert-definition — What Is Zone 2 Training?: Experts' Viewpoint on Definition, Training Methods, and Expected Adaptations
platform
International Journal of Sports Physiology and Performance · published-paper mirror
role
Professional context
published Or Updated
2025-02-26
accessed On
2026-09-27
locator
DOI 10.1123/ijspp.2024-0303; pp. 1–3, definition, continuous methods and Table 1.
scope
Zone terminology, conversational effort and fatigue during prolonged work.
limitations
Expert commentary focused on cycling, not an intervention trial; accessed as a mirrored journal PDF.
slugs
- zone-2
How to Measure Physical Activity Intensity ↗
id
self25-zone-2-cdc-intensity — How to Measure Physical Activity Intensity
platform
CDC
role
Official context
published Or Updated
2025-12-04
accessed On
2026-09-27
locator
Relative intensity; Tip: Talk Test; activity examples.
scope
Talk-versus-sing distinction, relative effort and general activity examples.
limitations
Public-health intensity categories; does not validate an individual's Zone 2 threshold or a fixed treadmill recipe.
slugs
- zone-2
Approach S70 Owner's Manual: Heart Rate Zone Calculations ↗
id
self25-zone-2-garmin-zone-chart — Approach S70 Owner's Manual: Heart Rate Zone Calculations
platform
Garmin
role
Service rules
published Or Updated
2026-04
accessed On
2026-09-27
locator
Heart Rate Zone Calculations table, Zone 2 row; manual v5 dated April 2026.
scope
This manual's 60–70% maximum-heart-rate range and effort description.
limitations
Manufacturer chart for a named device, not a physiological test or a universal Garmin configuration.
slugs
- zone-2
Adult Activity: An Overview ↗
id
self25-zone-2-cdc-adult-guidelines — Adult Activity: An Overview
platform
CDC
role
Official context
published Or Updated
2023-12-20
accessed On
2026-09-27
locator
Recommendations for adults and Move more, sit less.
scope
Weekly aerobic activity, smaller bouts and separate strengthening recommendation.
limitations
General adult recommendations, not a Zone 2 prescription or an individualized exercise plan.
slugs
- zone-2
Much Ado About Zone 2: A Narrative Review Assessing the Efficacy of Zone 2 Training for Improving Mitochondrial Capacity and Cardiorespiratory Fitness in the General Population ↗
id
self25-zone-2-evidence-review — Much Ado About Zone 2: A Narrative Review Assessing the Efficacy of Zone 2 Training for Improving Mitochondrial Capacity and Cardiorespiratory Fitness in the General Population
platform
Sports Medicine · published-paper mirror
role
Professional context
published Or Updated
2025
accessed On
2026-09-27
locator
DOI 10.1007/s40279-025-02261-y; abstract, sections 5–7 and declarations.
scope
Fitness response, training status and limits of mitochondrial/fat-oxidation superiority claims.
limitations
Narrative review with heterogeneous intensity definitions and few explicitly tested Zone 2 studies. Gibala declares an advisory/equity interest in Longevity League. Mirrored journal PDF; acceptance date is not treated as publication date.
slugs
- zone-2
Health Benefits of Physical Activity for Adults ↗
id
self25-zone-2-cdc-benefits — Health Benefits of Physical Activity for Adults
platform
CDC
role
Official context
published Or Updated
2026-03-10
accessed On
2026-09-27
locator
Immediate and Long-term benefits.
scope
Sleep, anxiety, blood pressure, heart disease and type 2 diabetes benefits.
limitations
Evidence for physical activity broadly; no specific Zone 2 superiority or personal result promised.
slugs
- zone-2
Physical Activity and Your Weight and Health ↗
id
self25-zone-2-cdc-weight — Physical Activity and Your Weight and Health
platform
CDC
role
Official context
published Or Updated
2026-04-07
accessed On
2026-09-27
locator
Why it's important; How much physical activity do I need?
scope
Activity, food intake, energy balance and individual variation in weight outcomes.
limitations
Does not compare fat oxidation between training zones or establish a Zone 2 weight-loss dose.
slugs
- zone-2
How Do Beta Blocker Drugs Affect Exercise? ↗
id
self25-zone-2-aha-beta-blockers — How Do Beta Blocker Drugs Affect Exercise?
platform
American Heart Association
role
Professional context
published Or Updated
2024-01-18
accessed On
2026-09-27
locator
Concerns about exercising while on beta blockers; last-reviewed line.
scope
Medication-related heart-rate changes and clinician-guided exercise targets.
limitations
General medication context; no advice to alter medication or calculate a personal target.
slugs
- zone-2
Being active when you have heart disease ↗
id
self25-zone-2-exercise-symptoms — Being active when you have heart disease
platform
MedlinePlus · A.D.A.M. Medical Encyclopedia
role
Professional context
published Or Updated
2024-08-05
accessed On
2026-09-27
locator
Pace Yourself and Know Your Limits; When to Call the Doctor; review date.
scope
Stopping for concerning exercise symptoms and seeking medical assessment.
limitations
Written for people with heart disease; used for symptom precautions, not its disease-specific exercise prescription.
slugs
- zone-2
Impact of 9 months of Zone 2 training on normal person ↗
id
self25-zone-2-community-nine-months — Impact of 9 months of Zone 2 training on normal person
platform
Reddit · r/PeterAttia
role
Community discussion
accessed On
2026-09-27
locator
Opening post by Stllabrat, training schedule/results and author's follow-up; surrounding replies about intensity.
scope
Everyday breathlessness, modest measured fitness change, unchanged resting pulse and mixed training.
limitations
Single self-report with several simultaneous training changes and unverified measurements. Opened view gave a relative post age; exact publication date not asserted.
slugs
- zone-2
Zone 2 problem - How should you run comfortably? ↗
id
self25-zone-2-community-running-tradeoffs — Zone 2 problem - How should you run comfortably?
platform
Reddit · r/running
role
Community discussion
accessed On
2026-09-27
locator
SugarMicro's opening post; ThereIsOnlyTri's limited pace-change report; deleted-account run–walk experience and surrounding replies.
scope
Awkward slow gait, differing pace outcomes and preserving energy for faster workouts.
limitations
Self-reports and conflicting suggestions. One retained reply has a deleted author. Absolute date appeared in search extraction, but opened page showed only relative age; no exact date recorded.
slugs
- zone-2
Zone 2 running is absurdly slow (slower than walking) — am I doing this right? ↗
id
self25-zone-2-community-watch-settings — Zone 2 running is absurdly slow (slower than walking) — am I doing this right?
platform
Reddit · r/Garmin
role
Community discussion
published Or Updated
2026-05-06
accessed On
2026-09-27
locator
Successful_Ebb3934's original account and explicit May 6, 2026 update; nose-breathing exchange with Far_Perspective_753 and reply by dogchips.
scope
Changed zone-calculation method, reported running experience and conflicting nasal-breathing cues.
limitations
May 6 is the author's stated update date, not the original posting date. No independent measurement confirms zones, device accuracy or threshold.
slugs
- zone-2
Zone 2 Question ↗
id
self25-zone-2-community-boredom — Zone 2 Question
platform
Reddit · r/PeterAttia
role
Community discussion
accessed On
2026-09-27
locator
No_Bluepill's post and reading follow-up; Candy_Bright's social/audio routines and Legal_Squash689's uninterrupted-time reply.
scope
Boredom despite television, reading, social walks, audio and quiet-time preferences.
limitations
Individual preferences, not adherence trial results. Replies also make unsupported physiology/duration claims that are not adopted. Opened view showed relative dates only.
slugs
- zone-2
Easy run equals running painfully slow while everyone passes ↗
id
fit-rebuild-easy-miles-x-stadium — Easy run equals running painfully slow while everyone passes
platform
X.com posts
role
Community discussion
accessed On
2026-09-27
published Or Updated
2026-09-27
locator
Post by Siddurp2 on September 27, 2026, and the short replies visible under it
scope
A report that easy running felt embarrassingly slow because other people passed, with joke replies rather than a pace rule.
limitations
A handful of posts. The replies did not debate heart-rate models. A joke is not evidence of a training result.
slugs
- easy-miles
What’s your opinion/interpretation on research about polarised vs pyramidal training? ↗
id
fit-wave-polarized-counting — What’s your opinion/interpretation on research about polarised vs pyramidal training?
role
Community discussion
accessed On
2026-09-23
locator
Post and selected visible replies returned by web search.
scope
Runners discuss intensity-zone definitions, time versus session counting, event priorities and the fatigue of frequent hard sessions.
limitations
Selected public, self-selected reports and opinions; identities, outcomes and explanations are unverified. Not a representative sample, consensus, prevalence estimate, treatment recommendation or training prescription. Linked research and physiological mechanisms in comments were not independently adopted.

Keep this topic in view

Preserved original record

Earlier public profile and reader notes are preserved separately from the current article. They may contain superseded wording and are not newly checked material.

Read the full original profile

slug

easy-miles

name

Zone 2 / easy cardio

aliases

easy miles
easy running
Zone 2 training
low intensity cardio
zone-2
zone 2 cardio
easy cardio
conversational pace
mitochondrial cardio

family

run

heat

high

talk

Lots of talk

most Discussed

true

first Line

why Line

feel Words

zone 2
easy miles
conversational
too slow
80/20

common Picture

lead
Session reports: 20–60 minutes, often 2–4 times weekly
why
Some longer training weeks contain 2–4 total hours of easy work. [community]
lead
About 80% easy is a discussion shorthand
why
It is not a fixed rule for every week or a universal limit of one hard day. [community]
lead
Other easy cardio can sit alongside running
why
Walking and cycling appear in wider plans, though they are not literal running miles. [community]

watch For

If you cannot talk, it is not easy. A gadget is optional. Calling a hard 5K a base-builder.

what People Say

The job: Build a base they can repeat. [community]
2026 r/running: “do I even need Zone 2?” is a weekly thread. The answer in the comments is usually “you need easy volume, the brand name is optional.” [community]
Strength Running (Nov 2024 and after): Zone 2 needs volume; a tiny easy jog is not a program. [community]
Seiler’s polarized model (lots easy, a little hard) is the coach version of the same week. [community]
Attia / San Millán made Zone 2 a personality. 2026 threads ask if it is oversold. Hybrid people keep both easy and one hard day. [community]
The Maffetone formula (180 − age) is discussed as a heart-rate (HR) cap. [community]
Recreational runners race their easy days because easy feels embarrassing. [community]
You don’t need a $400 strap to start. The sentence test is the tool. [community]
Watch algorithms lie on heat, caffeine, and bad sleep. [community]
A running report needs the session details: pace, heart rate and described effort can tell different stories about the same run. [community]
12–3–30 and rucking often land in this band if they can still talk. [community]

how People Run It

Slow down until they can talk. [community]
Separate easy effort from hard sessions: the number of hard days depends on the wider plan. One hard day is a familiar example, not the definition of easy miles. [community]
Hills: they walk or shuffle instead of racing. [community]
Podcast pace is a synonym. If they cannot follow the sentence, they slow down. [community]
Indoor bike + a show is how rainy people keep minutes. [community]
They do not check Strava average pace as a score on easy days. [community]
New runners: walk/run is still easy miles. See Couch to 5K. [community]

amounts People Use

Share people quote: about 80% easy. [community]
Time: 20–60 min a session; Attia-shaped talk is 2–4 hours/week easy. [community]
Days: 2–4 easy sessions. [community]
Heart-rate shorthand: roughly 60–70% of maximum heart rate (HRmax), or 180 − age, appears in the talk. These are different ways of estimating effort, not interchangeable personal measurements. [community]
Lactate nerd target: ~1.5–2.0 mmol — lab people only. [community]

how People Keep It

A loop they know is slow. Same route, no racing the segment. [community]
A buddy who will actually talk. [community]
Bike if the jog always turns into a tempo. [community]
They hide the pace on the watch if they cannot resist. [community]
Easy is the default. Hard needs a reason. [community]

how It Feels

Embarrassingly slow. Then the long run stops wrecking Tuesday. [community]
Ego death in public. Someone they used to pass is still chatting. [community]
After a month: they finish fresher. That is the hook. [community]
If they keep racing easy days: they are tired and “not built for running.” [community]
Heat / bad sleep: the same pace is no longer easy. They slow more. [community]
The good version: slightly bored, slightly proud they did not race. [community]

how Long People Run It

Most weeks they run. This is the default, not a phase. [community]
Base-building blocks are almost all this. [community]
Race season still keeps most miles easy. [community]
A week of only hard sessions is how people get injured and take a month off. [community]

deep Dive

Zone 2 the brand vs easy the job. The job is what matters. [community]
Couch-to-5K is the named walk/run on-ramp. [community]
Long run is just a longer easy day for most people. [community]
Hard cardio / VO2 describes demanding sessions elsewhere in some plans; it does not establish a universal one-day allowance. [community]
Steps do not establish an intensity zone: neither a step count nor calling a session purposeful shows where it falls in a particular zone system. [community]

watch For Long

If you cannot talk, you left easy. [community]
You do not need a $400 strap to start. [community]
A hard 5K is not a base-builder. [community]
Zone 2 as a gadget religion is optional. [community]
Chest pain, fainting, or wheezing that is not just “unfit”: a person and a clinician. [community]

related

couch-to-5k
long-run
hard-cardio-day
vo2-intervals
twelve-three-thirty

research Pointer

house Pointers

href
/self/#ten-k-steps
label
STUDself · 10k steps
href
/self/#vo2-number
label
STUDself · VO2 as a number
href
/self/#walking-pad
label
STUDself · Walking pad

play Pointer

—

sources

r/running 2026 Zone 2 threads
Strength Running Zone 2
Seiler polarized talk

disclaimer

Community talk may be wrong. Not medical, training, or diet advice. Sharp pain, fainting, or disordered-eating concerns need a clinician.

quick Answer History

field
commonPicture
rows
- lead
  Most of the week easy
  why
  80/20 / polarized talk. Recreational runners often only do 50–60% easy. [community]
- lead
  20–60 minutes
  why
  A session, not a personality. [community]
field
howPeopleRunIt
rows
- Save the hard day for one session, not five. [community]
field
deepDive
rows
- Hard cardio / VO2 is the one expensive day. [community]
- Steps are not automatically Zone 2. A purposeful easy session is. [community]
field
firstLine
rows
- Most of the running week is supposed to be slow enough to talk. That is the part people skip.
field
whyLine
rows
- Easy miles are how people stack volume without turning every jog into a race.
field
commonPicture
rows
- lead
  Talk test: full sentences
  why
  The free definition on r/running. [community]
- lead
  Easy share slogan: about 80% of the week
  why
  The notes retain this as a discussion shorthand. [community]
- lead
  Walk, easy jog, bike
  why
  Whatever they will repeat. Bike is easier to stay easy on. [community]
- lead
  Sessions: 20–60 minutes, often 2–4 times a week
  why
  Some longer-week accounts describe 2–4 total hours of easy work. [community]
- lead
  One hard day at most
  why
  The sibling card. Not five. [community]
field
whatPeopleSay
rows
- Maffetone (180 − age) still has fans as an HR cap. [community]
- Self already has a Zone 2 habit card. This card is the running session. [community]
field
amountsPeopleUse
rows
- HR talk: roughly 60–70% HRmax, or Maffetone 180 − age. Individual. [community]

Read the preserved reader notes

definition

Easy miles are runs kept at a comfortable effort, while Zone 2 is a training-zone label whose definition depends on the system being used.

community Picture

Runners compare conversational effort, pace and heart-rate displays when deciding what counts as easy, especially when those indicators seem to disagree.

additions

text
One runner in a February 2026 Q&A reported an easy-feeling run that a device classified very differently by pace and heart rate. The resulting question was about which zone label to follow, not whether the runner had tried hard enough. A report of Zone 2 therefore needs its measuring context: heart-rate zone, pace zone and a description of effort are not the same piece of information.
sources
- fit-running-context — Official Q&A for Wednesday, February 18, 2026

guide

what

The moving part is effort that can be repeated, not a pace on a watch. Easy running is the session where sentences still come out. Zone 2 is a chart label, and the chart changes. In Stephen Seiler's 2010 review, the Norwegian Olympic five-zone scale puts zone 2 at about 72 to 82 percent of maximum heart rate and about 1.5 to 2.5 mmol of lactate.
The same paper uses a second map. Easy work there is everything that holds lactate under about 2 mmol, and that side is called zone 1, not zone 2. A watch printing zone 2 may mean either map, or neither. Hal Higdon's novice half page, a different system, puts conversational running at about 65 to 75 percent of maximum pulse.
CDC's intensity page, updated December 4, 2025, never says Zone 2. Moderate effort can talk but not sing. Vigorous effort allows only a few words. Jogging is listed as vigorous in absolute terms, and the same activity can be moderate for a fitter person.

how

Start slower than the pace that feels useful. Settle until a full sentence is possible. On the CDC talk test, talk-but-not-sing is moderate and a few words is vigorous. For an easy run, stay where speech is comfortable. Hills get a walk or a short shuffle. The session still counts.
Keep the day as one continuous piece. Do not save a surge for the last kilometer. CDC rates effort from 0, sitting, to 10, maximal, with moderate at 5 or 6 and vigorous from 7 or 8. Use that only as a rough check. Heat, hills, and a bad night move the pace at the same effort. Do not let an average lap decide the day was easy.
Place easy days around any harder day. Seiler describes athletes training about 10 to 13 times a week, with about 80 percent of sessions under about 2 mmol. That is a large-week count, not a rule that three runs must include a hard one. A Couch to 5K walk-run is still the easy side of the week. A bike or a walk can hold minutes when running is off. It is not a running mile. If a heart-rate number and the sentences disagree, keep the sentences.

understand

The slow pace is the content of the session. Seiler cites Foster's finding that midlevel athletes tend to push easy days up and hard days down. The medium day feels busy and leaves the next day medium too. Easy miles are the correction. A hard 5K is a different session.
Zone 2 as one heart-rate rule adds a number these systems do not share. The Norwegian band, Higdon's 65 to 75 percent note, and the CDC talk test are three tools. None is a personal lab test. Seiler's scale was a coaching language for endurance athletes, and he notes that one heart-rate percent does not match every person's lactate.
A single short jog is not the large easy week in that 2010 review. Chest pain, fainting, wheezing that is not ordinary hard breathing, sharp pain, or eating that has become rigid or punishing is the point to stop and see a clinician. The notes below are pace arguments, not a new zone chart.

sources

fit-guide-easy-seiler-2010 — What is Best Practice for Training Intensity and Duration Distribution in Endurance Athletes?
fit-guide-easy-cdc-intensity — How to Measure Physical Activity Intensity
fit-guide-easy-higdon-half-pace — Novice 1 Half Marathon Training Program

summary Sources

fit-wave-polarized-counting — What’s your opinion/interpretation on research about polarised vs pyramidal training?

note References

field
whatPeopleSay
index
9
text
A running report needs the session details: pace, heart rate and described effort can tell different stories about the same run. [community]
sources
- fit-running-context — Official Q&A for Wednesday, February 18, 2026
field
amountsPeopleUse
index
3
text
Heart-rate shorthand: roughly 60–70% of maximum heart rate (HRmax), or 180 − age, appears in the talk. These are different ways of estimating effort, not interchangeable personal measurements. [community]
sources
- fit-running-context — Official Q&A for Wednesday, February 18, 2026

Download original public profile Download complete article

End of Zone 2 / easy cardio