Before we get in to the design of fitness trackers, let’s talk about what fitness trackers actually do. Fitness trackers simply digitally encode some form of information that comes from our bodies, and then present that data to us in a meaningful way. More specifically, the fitness tracker records one or more biological indicators (bioindicators), translates that indicator into electrical signals, translates those electrical signals into data that can be stored, converts that data into some metric that is then recorded to some sort of database, and then displays these metrics in a way that possibly makes sense to you. There’s a lot of processing that must happen to get that step count to you at the end of the day, and ther...
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