An evolutionary-framed principle: slow, unhurried movement reads as predator-like power and safety, while rapid, jerky, attention-jumping reactions read as prey-like fear — people unconsciously feel more comfortable around the former ("Doesn't mean that they're dangerous, just means that they're slow"). This extends to handling interruptions: don't let attention get instantly ripped away by a noise or interruption mid-conversation. Finish the thought (or let the interrupter finish), then return deliberately — "Hey, good to see you. What were you asking about?"
The recovery move benefits both parties at once: the original speaker feels valued rather than dropped, and the interrupter still gets acknowledged once you circle back.
Related: Confident Entrance (Body Language & Energy), Confidence as Survivability ("I Will Be Okay")
Chase Hughes's concrete drill for training the "movement" trip wire (see The Five Authority Trip Wires): for a week or two, cap all gestures and movement at the speed you'd move if you were standing in a swimming pool or underwater. His stated premise, drawn from his claimed 30,000+ hours of behavior-profiling observation: fear speeds up the human body — its gestures, movements, and everything else — so deliberately slowing down reads as the physical opposite of fear and builds comfort, confidence, and control.
Paired with a posture checkpoint, see Posture Alignment Drills (Ears-Heart-Pelvis & the Rearview Mirror Trick).