Using a Fitbit to log activities is potentially the beginning of the quantified self which is the notion of logging all aspects of one's daily life.
The notion of the quantified self is that wherein the individual in question records all of his activities and also measures these against some standards. The intention of quantifying one's self is usually to be able to determine growth over time.
Quantifying activities will also help a person to be more intentional about the things that they do. So, people who log all aspects of their lives can be said to be quantifying themselves.
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