Marshall draws a sharp line between "habit" — a word he says has gotten "expanded, contracted, gotten confused," now mostly meaning *additions* to life like flossing or "going to the gym three times per week" — and a deeper category he calls **entrainment**: > "Entrainment is a not-actively-conscious, nearly automatic response to a stimulus." The key features: it is triggered by a *stimulus*, it runs *without active consciousness*, and it is *trained in*, not chosen in the moment. A Navy SEAL returning from a mission cleans, inspects, and re-packs his gear as a fixed ritual; the stimulus (mission end) fires the response (full closeout) automatically. A Madrid accountant, asked for anything, automatically replies "mañana" — the same mechanism, pointed the wrong way. Entrainment is therefore neutral and ever-present: it already "rules our lives," for better or worse. Most of what you do on any given day you do reflexively, not by deliberation. The leverage is not to add more conscious effort but to *choose which responses get entrained* — to deliberately install the automatic reactions you want and retire the ones you don't. This is the operational engine behind [[Upstream Effects]]: you set the stimulus-response wiring upstream so the right behavior fires downstream without willpower. --- *Source: [[Book Inventory/Progression|Progression]] (Sebastian Marshall, 2016) — Upstream Effects #2 — Entrainment*