HealthKit watchOS 4.1 to 4.2 API Differences

HKMetadata.h

Added HKMetadataKeyAverageSpeed

Added HKMetadataKeyMaximumSpeed

Added HKMetadataKeyAlpineSlopeGrade

Added HKMetadataKeyElevationAscended

Added HKMetadataKeyElevationDescended

HKTypeIdentifiers.h

Added HKQuantityTypeIdentifierDistanceDownhillSnowSports