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Have you ever looked into heart rate variability (HRV for short)? You definitely should, because this value is an important indicator of your performance. In this video, Sonja von Opel explains what heart rate variability is, what it means and how to determine it. There is more information here: https://www.runnersworld.de/training-... The chapters of this video: This is HRV 0:00 Meaning of HRV: 4:57 Measuring HRV: 5:56 Good and bad HRV: 8:26