com.google.android.gms.fitness Contains the Google Fit APIs.
com.google.android.gms.fitness.data Contains the Google Fit data model.
com.google.android.gms.fitness.request Contains request objects used in Google Fit API methods.
com.google.android.gms.fitness.result Contains response objects used in Google Fit API methods.
com.google.android.gms.fitness.service Contains APIs for exposing third-party sensors to Google Fit using a service.