Wearables (Biohacking)
Rings, straps, and watches — what they measure, what they miss, and how to use them without overfitting.
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Wearables (Rings/Straps/Watches)

What wearables are best at

  • Trends in resting heart rate and activity
  • Sleep timing consistency
  • Rough recovery signals (when used consistently)

Common pitfalls

  • Over-interpreting sleep stage charts
  • Comparing different devices as if they’re identical
  • Changing the algorithm output instead of the underlying behavior
  1. Pick 1–2 primary metrics (e.g., sleep timing + resting HR trend).
  2. Use weekly averages.
  3. Treat the device as a feedback loop, not a judge.

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