Healthkit HEALTHKIT: - import HealthKit; HKHealthStore() - Check availability: HKHealthStore.isHealthDataAvailable() - Request auth: healthStore.requestAuthorization(toShare:read:) - Requires NSHealthShareUsageDescription + NSHealthUpdateUsageDescription (add CONFIG CHANGES) - Requires com.apple.developer.healthkit entitlement (add CONFIG CHANGES) - Query: HKSampleQuery, HKStatisticsQuery for aggregated data - Common types: HKQuantityType(.stepCount), .heartRate, .activeEnergyBurned ---