# typesToCollect The quantity type samples that the data source automatically sends to the workout builder. ``` var typesToCollect: Set { get } ``` ## Discussion The workout builder automatically collects the listed data types. The available data types vary depending on platform, the person’s settings and the workout configuration, and can include types like [`basalEnergyBurned`](/documentation/HealthKit/HKQuantityTypeIdentifier/basalEnergyBurned), [`activeEnergyBurned`](/documentation/HealthKit/HKQuantityTypeIdentifier/activeEnergyBurned), [`heartRate`](/documentation/HealthKit/HKQuantityTypeIdentifier/heartRate), [`distanceWalkingRunning`](/documentation/HealthKit/HKQuantityTypeIdentifier/distanceWalkingRunning), [`distanceCycling`](/documentation/HealthKit/HKQuantityTypeIdentifier/distanceCycling), [`distanceSwimming`](/documentation/HealthKit/HKQuantityTypeIdentifier/distanceSwimming), or [`distanceWheelchair`](/documentation/HealthKit/HKQuantityTypeIdentifier/distanceWheelchair). Some datatypes require you to support an external sensor like [`heartRate`](/documentation/HealthKit/HKQuantityTypeIdentifier/heartRate) on iPhone and iPad and cycling power and cycling cadence on Apple Watch. Once a person pairs a device, HealthKit handles getting the data from the device and saving it as samples to the Health Store, making it available to your app. To monitor this data, add a delegate to the session’s [`HKLiveWorkoutBuilder`](/documentation/HealthKit/HKLiveWorkoutBuilder) object, and implement its [`workoutBuilder(_:didCollectDataOf:)`](/documentation/HealthKit/HKLiveWorkoutBuilderDelegate/workoutBuilder(_:didCollectDataOf:)) method. --- 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)