The first iteration of the “Quantified Self” movement largely fizzled out about five years ago. Avid self-trackers, at the time, started to worry they were drowning in data, but lacking in insight.

The feature requires agreeing to an informed consent form. Quantified Self shows trends using fitness trackers and other gadgets to closely measure numerous health metrics to help you improve. Fitbit ...

Fitbit today offered a number of guided programs as part of its premium subscription. The Google-owned company is now testing one called Quantified Self that’s personalized and involves using “Fitbit ...

Like many of us, David Jay sets goals for himself every New Year's. But to track his progress, he goes a step further than many: He spends time each week entering detailed information about his life ...