Activity tracking devices and apps are positioned to enhance healthy behavior. Albeit positive outcomes are widely anticipated, many users abandon their devices and apps after short time which raises concerns about their effectiveness. Studies indicate that self-tracking can provoke –positive but particularly negative– emotions with which individuals have to cope. Though studying emotions in IS usage is gaining attention, the role of system-unrelated emotions has been largely neglected yet has been shown to play an important role in human behavior. To address this gap, this study theorizes how system-unrelated emotions ‘carry-over’ into activity tracking continuance decisions. Results of an experimental survey largely support the ‘carry-over’ effect in continuance decisions – particularly for less experienced users. Our study thereby contributes to the growing self-tracking literature but also to research on emotions in IS usage by highlighting the powerful role of system-unrelated emotions.