Journal
Field notes from the work.
One issue a week. Published on Substack.
What biofeedback is and how it can help you. What I am reading on assessment days. What is moving in programmes. How the method changes when the input under everything is trained.
Archive · 2 issues
All issues on Substack →Method note
What slow breathing actually does inside your autonomic nervous system
First in a four-part arc on resonance frequency breathing. The physiology underneath it, and the three numbers I read in every session: morning RMSSD, HRV-CV, and training LF power.
26 May 2026Read on Substack →Method note
Welcome. What This Letter Is For.
Founder letter. A research participant came to train his nervous system for judo. The most useful skill he built was the one that put his five-year-old to sleep.
17 May 2026Read on Substack →