life1life1Zone 2 is the easy end of training that still counts: a pace you can hold for a long time while speaking in full sentences. Endurance coaches have used it for decades because most of the week’s volume can be done there without digging into recovery.
Training zones split effort into bands of heart rate or power. Zone 2 is usually described as roughly 60 to 70 percent of maximum heart rate, or the effort at which breathing is noticeably deeper but you can still talk. The exact band differs between zone systems, which is why the talk test is often more useful than a number.
Three common ways: the talk test (full sentences, not single words); a percentage of estimated maximum heart rate, which is only a rough estimate because maximum heart rate varies widely between people of the same age; or a lab or field test that measures where lactate begins to rise. Most people start with the talk test and adjust.
Public health guidance such as the WHO physical activity guidelines recommends at least 150 to 300 minutes of moderate activity a week for adults. Zone 2 work is one way to accumulate it. The appeal is that it is repeatable: you can do it most days without being too tired for the next session.
Zone 2 is not a treatment for any condition and does not replace medical advice. If you have a heart condition or take medication that affects heart rate, the number on your watch may not mean what it means for someone else; a clinician is the right person to ask.
In LIFE1. In a LIFE1 Train session, live heart rate streams from your Apple Watch or Wear OS watch and route recording keeps the splits and elevation. Trends show your resting heart rate over the weeks, drawn as recorded.
They overlap, but the “fat-burning zone” label on gym machines is a simplification. Fuel use shifts gradually with intensity; zone 2 is defined by sustainability of effort, not by which fuel dominates.
Wrist optical heart rate is usually fine for steady efforts like zone 2. Chest straps are more accurate during intervals and when the arm moves a lot.
Coaches often use 30 to 90 minutes, but the right length depends on your training history. The talk test is the guide: if you cannot speak in sentences, it is no longer zone 2.
LIFE1 shows what you measured and what published guidelines say. It does not diagnose, interpret or treat. This page is general information, not medical advice.