“…Many systems have been built to examine physical activity [11,35,38,56], bioinformatics data such as heart rate and ECG data [15,16,40,49], location [6,27,54], ecologically friendly activities [22,37], and music [20,50]. These domains are tracked for a variety of reasons, including to make healthier decisions or track health factors [8,38,41,55] or simply to know thyself [19,32,33].…”