F itness enthusiasts who want to track their health data generally rely on trackers from Fitbit and Garmin. These devices provide accurate data and many insights to help improve o ...

The stress tracker is especially interesting as it charts your body's stress levels, provides feedback on how to lower them, and can paint a picture of how your body handles stress overall.

For example, you could receive interesting explanations about how your activity impacts your sleep, with a chart that helps you visualize the connection. Fitbit Labs is an opt-in program available ...