The study did not assign people to routines, follow an evening walking programme, or establish that regularity caused the differences. An evening walk could be one of those cues, but it is not the only one. An evening walk can act as one stable point inside an otherwise changeable schedule. An evening walk is one possible container for reflection, not a rule for emotional health. The quiet argument against optimisationThere is a temptation to transform the evening walk into another system.