The effects of physiological arousal on persuasion are investigated. An exercise task was used to manipulate physiological arousal, and systolic blood pressure readings were taken to assess the effectiveness of this manipulation. The results indicate that endorser status (celebrity or noncelebrity) has a stronger influence on brand attitudes under high than under moderate levels of physiological arousal, whereas argument strength has a greater impact under moderate than under high arousal levels. The results are consistent with the Elaboration Likelihood Model of persuasion.