I think it would be awesome to see an overall health score that analysizes your day and gives you a "score" as to how you have done with activity, water, sleep, nutrition, etc... Then instead of managing each individual data point, you could monitor and track your progress against your Fitbit score.
This could also become social and gamify the Fitbit app. You can share your score and compete against others and their scores. There is so much that could be done here.
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