Long-form pieces on heart-rate variability, breathing, measurement, and the science of the autonomic nervous system. No wellness fluff. Read at your own pace.
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2026·05
How to connect your heart rate monitor (chest straps, GPS watches, Apple Watch, and more)
Heart Resonance reads heart rate over Bluetooth — but not every device broadcasts it by default. A practical guide to every major device type: what works out of the box, what needs a setting change, and what to do if you have an Apple Watch.
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2026·04
What HRV actually measures (and what your wearable gets wrong)
Consumer wearables surface a single daily HRV number. But HRV is a family of metrics measuring different things, and the wrist-PPG sensors most wearables use throw away a lot of the signal. A guide to what's real and what's approximation.
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2026·04
Why there's no universal "6 breaths per minute"
The internet has settled on 6 BPM as the magic coherence-breathing rate. It's a reasonable starting guess and it's also wrong for most people, sometimes by enough to halve the training effect. What the Vaschillo protocol actually showed, and what that means for your practice.
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2026·04
Heart coherence in plain English
A guided tour of Shaffer 2020 — the six criteria that quantify coherence, what each one is actually measuring, and why any single coherence score hides information you'd want to know.
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