Heart Rate Zones
Heart Rate Zone Training for Runners
A runner-focused guide to heart-rate zone training: how zones work, how to set them, how to use them for easy runs, long runs, tempo work, intervals, and weekly planning.
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Clear guides to heart-rate zones, recovery, and the bigger picture.
Heart Rate Zones
A runner-focused guide to heart-rate zone training: how zones work, how to set them, how to use them for easy runs, long runs, tempo work, intervals, and weekly planning.
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Heart Rate Zones
Heart rate zone training helps cyclists turn rides into purposeful recovery, endurance, tempo, threshold, and VO2 max work. Learn how to set zones, use the calculator, pair heart rate with power, and build better cycling weeks.
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Data Diagnostics
Apple Watch heart rate zones are often useful for steady endurance training, but accuracy depends on wrist sensor quality, zone settings, max heart rate estimates, workout type, and conditions.
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Data Diagnostics
A high heart rate on an easy run usually means the internal cost of the run is higher than expected. Learn the common causes, what to check first, when to slow down, and when to treat it as a medical or recovery warning sign.
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Recovery & Readiness
A higher-than-usual resting heart rate can reflect training stress, poor sleep, dehydration, heat, caffeine, alcohol, illness, fever, medication effects, or measurement noise. Learn how to compare it with your baseline and decide what to do next.
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Recovery & Readiness
You are likely under-recovered when performance, effort, sleep, mood, soreness, HRV, resting heart rate, and pain signals trend worse together and do not rebound after easier days.
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Recovery & Readiness
Endurance athletes should track recovery as a trend, not a single readiness score. Learn which subjective and objective signals matter, how to review them weekly, and how to adjust training.
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Training Load
You trained too hard this week if load rose faster than recovery could absorb it. Learn the warning signs, what to check in your training log, and how to decide whether to repeat, reduce, or redistribute next week.
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Training Load
Acute training load is recent stress, while chronic training load is the baseline you have built over several weeks. Learn how to compare them, what the acute:chronic workload ratio can and cannot tell you, and how to use load trends in weekly training reviews.
Read storyZone Training Log
A privacy-first training log for iOS and Android. Free to start. Yours to make personal.
