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Zone 2 running

Running / Popular

Train at an easy aerobic heart rate and know why it works.

What coaches agree on

  • Most of your weekly running — commonly cited as about 80% — should be at an easy, zone 2 effort, with the rest done at harder intensities.
  • Zone 2 builds your aerobic engine: more mitochondria, more capillaries, and a more efficient heart, which is what drives better fat-burning, recovery, and endurance capacity over time.
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  • A comfortable, conversational pace — or an effort around 3 to 5 out of 10 — is a reliable, low-tech way to gauge zone 2 without needing precise heart-rate data.

Common mistakes

  • Heat, hills, trail terrain, or simple fatigue can push your real effort into zone 3 even when your pace or plan says zone 2, so chasing a pace target instead of watching effort quietly piles up fatigue over a training block.
  • The standard 220-minus-age formula for max heart rate is a rough population average that's often off by 10 or more beats per minute, and even a well-calculated zone shifts as fitness changes, so a number set once and never rechecked goes stale.
  • Obsessing over hitting a precise zone 2 heart-rate number as a brand-new runner adds pressure that isn't necessary yet — at that stage, running consistently matters far more than the exact number.