Agustín Molina, Deirdre E. O’Shea, Alexandra Michel, M. Gloria González-Morales, Anna Steidle, Annekatrin Hoppe

• Drawing on theories of trait activation and mindfulness-to-meaning, we investigate the ways in which trait mindfulness has its effects on daily outcomes. We propose that trait mindfulness operates via the mechanism of affect and is associated with higher daily positive affect, which is in turn related to better daily energetic wellbeing (higher vigor, lower fatigue) and cognitive resources (higher concentration, lower rumination). Additionally, we evaluated the moderating effect of a low-dose daily mindfulness intervention in the workplace compared to an active control on these relationships. We draw on data from employees in a large Irish public sector organization to test our hypotheses (1242 daily observations nested in 186 participants; nAC = 54, nMF = 132). Our findings highlight positive affect as a daily mechanism through which trait mindfulness impacts daily vigor, fatigue, concentration, and rumination. In addition, the intervention moderated the indirect effects from trait mindfulness to these outco