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Use the Health app on your iPhone or iPad - Apple Support
Apple Health on the App Store
Get to know the Health app on your iPhone - Apple Support
Manage Health data on your iPhone, iPad, or Apple Watch
Health - Apple
Use the Health app on your iPhone or iPad – Apple Support (MY)
The complete guide to Apple's Health app - CNET
Get started with Health on iPhone - Apple Support
HealthKit | Apple Developer Documentation
Get started with Health on iPad - Apple Support