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This study examined the role of personality traits in a 5-week physical activity intervention study for working adults. We tested whether personality traits predicted individual differences in change in daily steps over time. Fifty-two participants ages 35 to 69 (M_age = 49.71, SD = 8.64) wore a Fitbit Zip step counter for 35 days and completed a personality questionnaire. Participants were randomly assigned to either an implementation intention group or a control group. Both groups wore a Fitbit and had the goal to increase their daily steps. For the present study, the sample was collapsed across groups. Higher conscientiousness was associated with greater increases in daily steps. Also, individuals with healthy neuroticism, the combination of higher neuroticism and higher conscientiousness, showed greater increases in daily steps. The findings highlight that the efficacy of physical activity interventions may depend on …