Wearables are body-attached computers, such as fitness wristbands, intelligent glasses, or even smart clothes. Approximately 14% of Germans use wearables-particularly to track their personal activity and fitness or to optimize their lives. Related terms are "Quantified Self" and "lifelogging". Not only users, but also manufacturers, service providers, and insurance companies are interested in data collected by wearables. It enables corporate actors to offer individualized insurance tariffs or personalized health services. Important questions do not only relate to data protection and aspects of IT-security, but also to data quality, liability and data portability. However, many users blank out problematic issues of data protection and IT-security-or apply specific strategies of legitimation. For some users, permanent self-tracking is a source of motivation while others feel restricted, overwhelmed, or pressured by it.
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