Blog
Signal-focused explainers for Apple Health users charting VO₂max, sleep, gait, HRV, and cardiac load trends.
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Biological Age from Apple Health: What Moves the Number
Multi-signal bio age beyond VO₂ max — Cardiovascular, Recovery, and Metabolic sub-scores from HealthKit data.
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Zone 2 Cardio from Apple Health: Track Your Aerobic Base
How to derive weekly Zone 2 minutes from workout heart rate, hit 150+ min targets, and connect aerobic base to longevity.
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You Don't Need an Apple Watch to Track Longevity Signals
Wearables that sync to Apple Health — from budget bands to dedicated HRV straps — and what each one contributes.
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What Is a Good VO₂ Max by Age? Apple Health Cardio Fitness Explained
Reference ranges by age and sex, how Apple Watch estimates cardio fitness, and what it implies for longevity.
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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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HRV Baseline: How to Find Your Personal Heart Rate Variability Range
Why isolated HRV numbers mislead — and how to establish a baseline you can interpret week to week.
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Resting Heart Rate Trends: What Your RHR Says About Heart Health & Longevity
Why slow drift matters more than a single reading, optimal ranges, and what Apple Watch captures in Health.
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Sleep Efficiency vs Sleep Duration: Which Matters More for Recovery & Longevity?
Hours in bed versus time actually asleep — and how Apple Health frames both for recovery.
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Walking Speed and Longevity: Why Gait Speed Predicts Healthy Aging
The “sixth vital sign,” what speed thresholds mean, and how iPhone and Watch contribute data.
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Recovery Score: Training readiness from wearable data
A practical primer on composite readiness scores before you plan today's effort.