HKSwimmingStrokeStyle.backstroke The user swam the backstroke. Declarationcase backstroke See AlsoStrokesHKSwimmingStrokeStyle.breaststrokeHKSwimmingStrokeStyle.butterflyHKSwimmingStrokeStyle.freestyleHKSwimmingStrokeStyle.mixedHKSwimmingStrokeStyle.kickboardHKSwimmingStrokeStyle.unknown