Choose and Calibrate Training Zones
A zone is a decision aid, not a biological wall that appears at one exact beat.
Understand why zone systems disagree and choose a practical working model.
Choose the calculation method
Percentage-of-maximum zones are simple. Heart-rate-reserve zones also use resting heart rate. Threshold-based zones may be useful for experienced runners with reliable testing.
Interpret Zone 2 and Zone 3
Zone 2 usually supports repeatable aerobic work; Zone 3 is a steadier moderate effort with a larger recovery cost. Their numeric boundaries change with the model.
Calibrate with the run itself
Use conversation, breathing, perceived effort, and recovery to check the calculated range. Adjust the inputs when repeated observations consistently disagree.
Put it into practice
- Choose one primary zone method instead of mixing boundaries from several models.
- Calculate a first working range.
- Validate it during repeatable runs using conversation, breathing, effort, and recovery.
Your easy range usually matches controlled breathing and reliable recovery, without requiring constant pace changes to obey one beat.
Zone labels are not standardized. Zone 2 on one device may overlap Zone 3 on another.