# WorkoutAlert An alert that notifies the user of significant events during a workout. ``` protocol WorkoutAlert : Hashable, Sendable ``` ## Topics ### Determining support [`func supports(activity: HKWorkoutActivityType, location: HKWorkoutSessionLocationType) -> Bool`](/documentation/WorkoutKit/WorkoutAlert/supports(activity:location:)) Returns a Boolean value that indicates whether the alert supports the provided activity and location. ### Setting the alert metric [`var metric: WorkoutAlertMetric`](/documentation/WorkoutKit/WorkoutAlert/metric) The metric used to measure performance for the alert. [`enum WorkoutAlertMetric`](/documentation/WorkoutKit/WorkoutAlertMetric) A value that specifies the type of metric used to measure performance. ### Creating cadence alerts [`static func cadence(ClosedRange, unit: UnitFrequency) -> Self`](/documentation/WorkoutKit/WorkoutAlert/cadence(_:unit:)-y8da) Creates a new alert for a range of cadence values. [`struct CadenceRangeAlert`](/documentation/WorkoutKit/CadenceRangeAlert) An alert for a range of cadence values. [`static func cadence(Double, unit: UnitFrequency) -> Self`](/documentation/WorkoutKit/WorkoutAlert/cadence(_:unit:)-3fnpg) Creates an alert for the specified cadence threshold. [`struct CadenceThresholdAlert`](/documentation/WorkoutKit/CadenceThresholdAlert) An alert for a cadence threshold. ### Creating heart rate alerts [`static func heartRate(ClosedRange, unit: UnitFrequency) -> Self`](/documentation/WorkoutKit/WorkoutAlert/heartRate(_:unit:)) Creates a new heart rate alert for the target range. [`struct HeartRateRangeAlert`](/documentation/WorkoutKit/HeartRateRangeAlert) An alert for a range of heart rates. [`static func heartRate(zone: Int) -> Self`](/documentation/WorkoutKit/WorkoutAlert/heartRate(zone:)) Creates a new alert for the specified heart rate zone. [`struct HeartRateZoneAlert`](/documentation/WorkoutKit/HeartRateZoneAlert) An alert for a heart rate zone. ### Creating power alerts [`static func power(ClosedRange, unit: UnitPower) -> Self`](/documentation/WorkoutKit/WorkoutAlert/power(_:unit:)-57ekz) Creates a new power alert for the target range. [`struct PowerRangeAlert`](/documentation/WorkoutKit/PowerRangeAlert) An alert for a range of power values. [`static func power(Double, unit: UnitPower) -> Self`](/documentation/WorkoutKit/WorkoutAlert/power(_:unit:)-289mz) Creates an alert for the specified power threshold. [`struct PowerThresholdAlert`](/documentation/WorkoutKit/PowerThresholdAlert) An alert for a power threshold. [`static func power(zone: Int) -> Self`](/documentation/WorkoutKit/WorkoutAlert/power(zone:)) Creates a new alert for the specified power zone. [`struct PowerZoneAlert`](/documentation/WorkoutKit/PowerZoneAlert) An alert for a power zone. ### Creating speed alerts [`static func speed(ClosedRange, unit: UnitSpeed, metric: WorkoutAlertMetric) -> Self`](/documentation/WorkoutKit/WorkoutAlert/speed(_:unit:metric:)-1o2j) Creates a new speed alert for the provided range. [`struct SpeedRangeAlert`](/documentation/WorkoutKit/SpeedRangeAlert) An alert for a range of speed values. [`static func speed(Double, unit: UnitSpeed, metric: WorkoutAlertMetric) -> Self`](/documentation/WorkoutKit/WorkoutAlert/speed(_:unit:metric:)-4zald) Creates a new speed threshold alert. [`struct SpeedThresholdAlert`](/documentation/WorkoutKit/SpeedThresholdAlert) An alert for a speed threshold. ### Type Methods [`static func power(Double, unit: UnitPower, metric: WorkoutAlertMetric) -> Self`](/documentation/WorkoutKit/WorkoutAlert/power(_:unit:metric:)-2847m) [`static func power(ClosedRange, unit: UnitPower, metric: WorkoutAlertMetric) -> Self`](/documentation/WorkoutKit/WorkoutAlert/power(_:unit:metric:)-5c94p) ## Relationships ### Inherits From [`Equatable`](/documentation/Swift/Equatable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Hashable`](/documentation/Swift/Hashable) [`Sendable`](/documentation/Swift/Sendable) ### Conforming Types [`HeartRateZoneAlert`](/documentation/WorkoutKit/HeartRateZoneAlert) [`HeartRateRangeAlert`](/documentation/WorkoutKit/HeartRateRangeAlert) [`CadenceRangeAlert`](/documentation/WorkoutKit/CadenceRangeAlert) [`SpeedThresholdAlert`](/documentation/WorkoutKit/SpeedThresholdAlert) [`PowerThresholdAlert`](/documentation/WorkoutKit/PowerThresholdAlert) [`PowerZoneAlert`](/documentation/WorkoutKit/PowerZoneAlert) [`SpeedRangeAlert`](/documentation/WorkoutKit/SpeedRangeAlert) [`CadenceThresholdAlert`](/documentation/WorkoutKit/CadenceThresholdAlert) [`PowerRangeAlert`](/documentation/WorkoutKit/PowerRangeAlert) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)