Heart rate zones define exercise intensity levels. Training in specific zones yields specific results.
Zone 1 (50–60% max HR): Recovery. Zone 2 (60–70%): Fat burning. Zone 3 (70–80%): Aerobic. Zone 4 (80–90%): Lactate threshold. Zone 5 (90–100%): Anaerobic.
This tool is most useful for tracking trends rather than obsessing over a single data point. Run the calculation monthly with consistent measurement conditions to see whether your metric is moving in the right direction.
A frequent error is failing to control measurement conditions between calculations. Weight and body circumferences vary significantly throughout the day and with hydration levels. Always measure under the same conditions (same time of day, same equipment) to make comparisons meaningful.
A nurse calculates a patient's health metric during a routine assessment, then uses the result alongside other clinical indicators to contextualise the finding — correctly treating the number as one data point among several rather than a standalone answer.
5 intensity levels based on % of max heart rate. Each zone trains different energy systems and fitness outcomes.
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