Personalized five-zone training ranges
Zone 1 · 50–60%
Warm-up and recovery
Zone 2 · 60–70%
Endurance and easy aerobic work
Zone 3 · 70–80%
Aerobic fitness and tempo
Zone 4 · 80–90%
Threshold and speed work
Zone 5 · 90–100%
Short maximum efforts
Estimated maximum heart rate varies widely between individuals. Use a clinically supervised exercise test when precision matters or if you have a cardiovascular condition.
Evidence-based guide
Target heart-rate zones translate exercise intensity into beats per minute. They can help structure easy, moderate, threshold, and high-intensity sessions, but estimated maximum heart rate varies substantially between individuals.
The familiar 220 − age equation. It is simple but has wide individual error.
Maximum HR = 208 − 0.7 × age, derived from a broad meta-analysis of healthy adults.
Maximum HR = 211 − 0.64 × age, another population-based estimate.
Karvonen zones use heart-rate reserve and therefore account for resting heart rate. Percentage-of-maximum zones are simpler. Zone 2 supports easier aerobic work, while zones 4 and 5 should generally be used in shorter doses with adequate recovery.
Heat, dehydration, altitude, caffeine, stress, illness, and medications can shift heart rate. Beta blockers and some rhythm conditions make standard zone equations unreliable. Stop exercise and seek care for chest pain, faintness, or unusual shortness of breath.
Measure it after several quiet minutes, ideally after waking, and use an average across several days.
A properly supervised maximal test is more individualized, but it may not be appropriate for everyone.
Devices may use different maximum-HR formulas, resting values, and zone boundaries.
No. Training distribution depends on health, experience, and goals; most endurance training is usually performed at easier intensities.
