Training

Zone 2 Running: What It Is and Why It Builds Your Aerobic Base

By EverRun Team · Updated August 9, 2026 · 6 min read

If you've spent any time in running forums, you've heard "run more in Zone 2." It can be useful advice—but the target depends on the athlete. The common mistake is not skipping easy runs; it is turning most easy days into moderate efforts that are too hard to recover from well.

What Zone 2 actually is

Heart-rate zones split effort into bands based on maximum heart rate, heart-rate reserve, threshold, or another individual anchor. Zone 2 is often described as an easy, conversational aerobic effort. For many runners, it sits roughly around 60–70% of estimated maximum heart rate, but the precise range can vary substantially from person to person.

Calculate Your MAF 180 Zone 2 Heart Rate

The MAF 180 Formula is a popular, simple way to estimate a starting ceiling for aerobic training without a lab test. It is a general estimate, not a diagnosis or a personalized prescription. Calculate the basic version below:

Your Age:

Estimated Max Aerobic Heart Rate: 150 bpm

Your training zone would be between 140 and 150 bpm.

How to find your Zone 2 heart rate

You do not need a lab VO2max test to start. Two practical methods:

Estimated heart-rate range: 220 minus age, then 60–70% of that number, is a rough starting point. Individual variation is real, so use it cautiously.
Talk test: if you cannot speak in full sentences, ease off. It is a practical way to keep easy days genuinely easy when heart-rate data is noisy.

Zone	% of Max HR	Feel
Zone 1	50–60%	Recovery, barely a workout
Zone 2	60–70%	Easy, full conversation
Zone 3	70–80%	Moderate, "comfortably hard"
Zone 4	80–90%	Threshold, short sentences only
Zone 5	90–100%	Max effort, unsustainable

Why most runners overshoot it

Easy pace can feel surprisingly slow, especially beside faster training partners. But a calmer effort gives you room to recover for quality sessions and keep weekly training consistent. Heat, hills, stress, sleep, and sensor error can all raise heart rate, so let pace slow down when conditions call for it.

How much Zone 2 is enough

A common framework is roughly 80% of weekly volume at easy effort and 20% at moderate-to-hard effort. It is a framework, not a rule for every athlete or week. Build volume and intensity progressively, and adjust when fatigue, injury history, or medical guidance calls for a more conservative approach.

Track the pattern, not one perfect number

Use one easy run as a reference, then look for trends in pace, heart rate, sleep, training load, and how you feel. EverRun brings those signals into one iPhone training view; use our running pace calculator to plan a steady easy-run or race target.

This guide is general training education, not medical advice. If you have a health condition, symptoms, or concerns about exercise intensity, consult a qualified clinician.