Google Fit is a health-tracking platform developed by Google for the Android operating system. It is a single set of APIs that blends data from multiple apps and devices. Google Fit uses sensors in a user's mobile device
Google Fit is an open ecosystem that allows developers to upload fitness data to a central repository where users can access their data from different devices and apps in one location:
Fitness apps can store data from any wearable or sensor.
Fitness apps can access data created by any app.
User's fitness data is persisted when they upgrade their fitness devices.