The decision, whether taking stairs or the escalator is the better choice, has been charged with a new socio-political dimension lately. Both speed and convenience do hardly matter, yet it has turned into a question of fitness and health. As the Fitbit advertisement points out, “fitness is the sum of your life.” It can be found between beginnings and endings or between high and low ends of the exercise spectrum. Gone are the times when physical activity was confined to particular spaces reserved for heavy exercise—like gyms. Today we live in an almost endless sea of fitness opportunities, called: your daily life. Of major importance in this change is the popular trend of logging one’s activities with digital tracking devices,…

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“I track myself, therefore I am” is perhaps the most fitting way to describe the basic idea behind the Quantified Self movement which has gained popularity all over the world in recent years. Increasingly, people have started to record and measure their own body-related data, tracking changes over time in metrics such as body weight, blood pressure, caloric expenditure, and the ever-present Body-Mass-Index (BMI). Simultaneously, the sale corresponding apps, sensors, smartwatches, and weighing scales that provide the technical means to collect this data has experienced a continuing surge. The sensors on Nike+ devices, for example, track movement, distance, and speed during physical activities such as running. Apparently, people love collecting these data, fueled by the promise of becoming slimmer and…

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