Amazfit Balance 3 OTA 4 optimized the Running Lactate Threshold algorithm, while OTA 6 mainly improved the VO₂ max algorithm. Use the new data as a reference for adjusting intensity—not as a signal that you must run faster.
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The same 30°C can pose different risks depending on humidity, sunlight, wind and heat acclimatization. Check WBGT, reduce the workload, plan a rest point and stop at the first warning sign.
Suunto Run update 3.27.18 improves optical heart-rate monitoring performance. Before running by zones, still check the firmware, fit, sensor signal and personal zone settings.
Apple Health is useful for tracking running trends, but Apple Watch and treadmill distance readings may differ because they rely on different estimation methods. This article explains how to choose Indoor Run, calibrate the watch, interpret heart rate and VO₂ max, and avoid treating Insights as a medical diagnosis.