Short, plain notes on the mechanics behind the practice — no mysticism required to find them interesting.
Intermittent hypoxia — short, controlled dips in oxygen — trains the body's response to stress rather than just triggering it. The difference is the "on purpose" part.
A look at how breath-driven oxygen fluctuation appears to prompt mitochondrial adaptation — the same cellular machinery altitude training leans on.
Notes on why altered-state breathwork produces such varied subjective experience session to session, and why that's a feature, not noise.
A plain account of facilitating breathwork, guided with music, for a running club after a long Sunday effort, including the bits that didn't go to plan.