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Share health and fitness data on iPhone
Use the Health app 
to share your health and fitness data among other apps and devices. For example, if you install a workout app, its exercise data can appear in the Health app. The workout app can also read and make use of data (such as your heart rate and weight) shared by other devices and apps.
Control the sharing of data
Tap Sources to see the apps and devices you allow to read or write data.
To change your sharing options, tap the device or app.
Export all your health data
Tap Health Data, tap 
, then tap Export Health Data.
Your data is exported in XML format, a common format for sharing data between apps.