The Body and Nervous System
The mechanism underneath. Why body-based approaches reach things that talking about them does not, what "nervous system regulation" means once you strip the phrase back to something checkable, and where the evidence is genuinely strong.
Also where it isn't. A fair amount of what circulates about the vagus nerve and polyvagal theory has outrun the research it claims to rest on. Writing here says which is which.
Articles
What is CO2 tolerance and why is breathlessness rarely about oxygen?
CO2 tolerance is how strongly your breathing reacts to carbon dioxide. Why it matters for anxiety, how to test it, and how to build it with slow breathing.
Where this goes next.
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Or feel it instead
If you have read enough and want to feel it instead.