3.4 · Breath, Nervous System & Recovery
Body & Energy · 3.4
Breath
Excellent and genuinely useful on nasal breathing, CO₂ tolerance and slow breathing. Some historical and physiological claims are stretched for narrative effect — take the practices, hold the story loosely.
Deepen
Section titled “Deepen”The Oxygen Advantage
More rigorous, less readable. The technical companion to Nestor.
Burnout
"Completing the stress cycle" — the mechanism nearly every productivity book skips. Removing the stressor is not the same as discharging the stress.
Reference
Section titled “Reference”Light on Pranayama
My hierarchy names pranayama specifically. This is the primary source, not a modern repackaging of it.