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The science behind your data
Evidence-based articles on HRV, sleep, recovery, and what your watch, ring, and scale are really telling you. Grounded in peer-reviewed research.
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Health
Heatwaves and Your Body: What Heat Does to Heart Rate, Sleep and Your Data
A heatwave raises your resting heart rate, lowers your HRV and steals deep sleep. What is really happening, and what your wearable is and is not telling you.
2026-06-28
Training
Why Most of Your Training Should Be Easy
2026-06-23
Sleep
Can Your Smartwatch Detect Sleep Apnea?
2026-06-11
Devices
Amazfit Bip 6 — the $79.99 watch worth a second look
2026-05-25
Science
Your Chronotype Matters More Than You Think
2026-05-20
Devices
HRV Accuracy: Garmin vs Polar vs Fitbit vs Withings
2026-05-09
Recovery Science: How to Know When Your Body Is Ready
How Stress Affects Your HRV
VO2max: The Best Predictor of Longevity
Resting Heart Rate: What Your Number Means
Can Your Wearable Detect Illness Before You Feel It?
What Is HRV and Why It Matters
Biological Age vs Chronological Age
How Wearables Detect Illness Before You Feel Sick
Sleep Debt: The Hidden Cost of Lost Sleep
Overtraining: 5 Warning Signs Your Wearable Can Catch
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