Body language, eye contact, tone, hand gestures, and speech rhythm are argued to carry more weight than the literal words spoken in an interaction — but they are not a standalone skill. They are a downstream manifestation of a person's belief system and momentary emotional state.
Causal chain: beliefs → emotions → actions/body language. Change the belief (e.g. "I bring more value to this conversation than she does") and the body language corrects itself automatically — reportedly accounting for 90–95% of the fix, without ever coaching the gesture itself.
Why direct coaching backfires: a circa-2003 "most comprehensive" gesture analysis was factually accurate but backfired when taught directly to students. Students told which behaviors NOT to do did MORE of them (the brain doesn't process negatives well — "don't think of a purple elephant"). Students told which behaviors TO do either didn't implement them or came off fake and incongruent — worse than doing nothing. The act of making someone consciously monitor their own body language is itself what produces self-consciousness and worse body language.
Confidence over correctness: in a counter-anecdote, students told to execute an approach with full confidence succeeded despite objectively bad body language or game moves — belief carried the interaction more than technique did. See Confidence as Survivability ("I Will Be Okay").
Judge holistically, not atomically: a woman is argued to aggregate the net mass of signals rather than fixate on one gesture — a single odd mannerism or broken eye contact will not "blow up" an otherwise confident interaction. Compare Body Language Reveals What Words Conceal (body language as a signal channel for reading someone else) — this concept is about changing your own body language rather than reading someone else's.
For residual habitual gestures that don't resolve just by fixing belief, see Replace, Don't Eliminate (Habit-Change Heuristic).
A separate coaching video reports the identical failure mode and fix: giving students an explicit 'don't do this' body-language list right before live practice made them nervous and self-conscious, and they went out and did exactly those behaviors — the warning itself induced the symptom. A later version of the program dropped the behavioral checklist in favor of teaching confidence-building mindsets, and students showed better body language without ever being told the specific behaviors to avoid.
Closing frame from the same source: "what you believe about yourself, what you believe about the interaction, is being carried through in your body language at all times" — reinforcing that body language is a readout of internal state, not a set of poses to perform. See the specific checklist this source pairs with the warning: Anti-Seductive Traits (The Self-Awareness Gap).