In this study, we have investigated if trait mindfulness is associated with physical activity levels and if mindful playing (in-game mindfulness) increases daily wellbeing of players when playing a pervasive game. Initially participants (N = 49) completed a questionnaire measuring their trait mindfulness and physical activity levels. Next, they played Ingress for 14 days and completed questionnaire packets at the end of each day during the study. In-game mindfulness and wellbeing of the players were measured in the daily records. Finally, their physical activity levels were measured again after the diary period. Results showed that greater in-game mindfulness was associated with increased daily subjective vitality and decreased daily perceived stress, independent of trait mindfulness. Also, trait mindfulness predicted players' physical activity levels when playing Ingress. The implications of these results were discussed.