Somatic
Procedural memory & motor learning
Muscle memory is procedural memory — sequences drilled into the basal ganglia and cerebellum. Once a move is automated, you run it before you decide to: the reflex tap, the practiced yes, the rehearsed signature.
Mammalian
Belonging, status & authority pull
Who else is doing it, who approves of you, who you'd disappoint. Social gravity beats spreadsheets.
Cultural
Identity, mimetic desire & in-group pressure
Choices made to stay consistent with a story about yourself, or with the tribe you want in.