Update Note: This tutorial has been updated for Swift 4, Xcode 9 and iOS 11 by Ted Bendixson. The original tutorial was written by Ernesto García. HealthKit is an API that was introduced in iOS 8. It acts as a central repository for all health-related data, letting users build a biological profile and store workouts. In this HealthKit tutorial, you will create a simple workout tracking app and lea
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