WWDC26: Deliver workout insights with HealthKit workout zones | Apple
Apple integrates heart rate and cycling power workout zones into HealthKit for iOS 27 and watchOS 27.
“Workout zones turn raw data like heart rate samples into actionable training guidance.”
Apple's WWDC26 developer session introduces HealthKit workout zones, letting apps access heart rate and cycling power zone data, register for live zone updates, and provide custom zone configurations in iOS 27 and watchOS 27. This is a niche developer API announcement for health and fitness apps with no meaningful AI industry signal.