Blog

Signal-focused explainers for Apple Health users charting VO₂max, sleep, gait, HRV, and cardiac load trends.

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  HRV Explained: What Your Heart Rate Variability Is Actually Telling You

  Baselines, context, and how nightly variability fits into a broader longevity picture.

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  Recovery Score: Training readiness from wearable data

  A practical primer on composite readiness scores before you plan today's effort.