A key that indicates the length of a lap during a workout.
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let HKMetadataKeyLapLength: String
Set this key on a workout, workout segment, or a quantity sample that represents distance. Set its value to an HKQuantity object that uses length units (described in HKUnit).
let HKMetadataKeySwimmingLocationType: String
A key that indicates the location for a swimming workout.
let HKMetadataKeySwimmingStrokeStyle: String
A key that indicates the predominant stroke style for a lap of swimming.