What does it mean that behavior chains link actions into automatic sequences?

Example: A software developer named Marcus had seven discrete habits he performed every morning — grinding coffee, stretching, reviewing his calendar, writing three priorities, taking vitamins, filling his water bottle, and reading one page of a technical book. Each habit worked independently, but they never ran as a unit. Some mornings he did all seven, some mornings three, and the order shifted based on whichever he remembered first. After learning to chain them, he fixed the sequence so that each completion triggered the next: grinder off triggered stretching, stretching done triggered opening the calendar, closing the calendar triggered writing priorities, pen down triggered vitamins, swallowing triggered filling the water bottle, bottle full triggered opening the book. Within four weeks, the entire sequence ran automatically from the moment the grinder stopped. Marcus did not decide to do seven things each morning. He decided to do one — grind the coffee — and six more followed like cars behind a locomotive.

Try this: Map one existing behavioral sequence from your daily life — your morning wake-up, your work startup, your evening wind-down, or any recurring block where you perform multiple actions in rough succession. Write each action as a discrete step, then identify: (1) which transitions between steps are already automatic (the completion of one reliably triggers the next without conscious decision), (2) which transitions require a conscious decision or reminder, and (3) where the chain most often breaks. For the weakest transition you identified, write an explicit link statement: "The moment I finish [action A — described as a specific physical endpoint], I immediately begin [action B — described as a specific first physical movement]." Practice this single transition deliberately for one week, noting each day whether it fired automatically or required conscious initiation.