Heart & Metabolic Health - Fitness & movement
Heart-rate zones without false precision
Last reviewed 3 August 2026. How we write this.
Heart-rate zones estimate exercise intensity, but generic formulas and wearables are not individual laboratory tests.
Maximum heart rate varies substantially between people of the same age. Medication, heat, dehydration and fatigue also shift the response.
Use more than one signal
- Talk test for moderate versus vigorous work.
- Perceived exertion alongside heart rate.
- Pace or power trends in repeatable conditions.
- Symptoms always override a target zone.
Zones are tools for organising training, not health scores. Chest pain, fainting or disproportionate breathlessness warrants assessment.
Educational content only. This does not diagnose a condition or replace assessment and advice from a qualified healthcare professional.
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Educational content only. Not medical advice, diagnosis or treatment. Always consult a qualified healthcare professional before changing your health regimen.