HealthKit Read and write health and fitness data from the Apple Health store. Covers authorization, queries, writing samples, background delivery, and workout sessions. Targets Swift 6.3 / iOS 26+. Contents - Setup and Availability - Authorization - Reading Data: Sample Queries - Reading Data: Statistics Queries - Reading Data: Statistics Collection Queries - Writing Data - Background Delivery - Workout Sessions - Common Data Types - HKUnit Reference - Common Mistakes - Review Checklist - References Setup and Availability Project Configuration 1. Enable the HealthKit capability in Xcode (adds…