Health & Fitness

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Explore the technical aspects of health and fitness features, including sensor data acquisition, health data processing, and integration with the HealthKit framework.

Health & Fitness Documentation

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HKLiveWorkoutBuilder begincollection freezes in sim
When calling beginCollection on HKLiveWorkoutBuilder the function never completes and gets stuck. (On the second workout session, the first session works flawlessly) To reproduce: Run the MirroringWorkoutsSample on WatchOS https://developer.apple.com/documentation/healthkit/building-a-multidevice-workout-app. Start the workout and then end the workouts it should work perfectly fine the first time. Start the workout and end again, and you should see the problem, the workout doesn’t end.
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Can 3 party apps obtain Intervals information created using WorkoutKit?
I am developing a running training app that coaches can use to create interval workout plans. I can use HKWorkout to get information about Splits similar to that in Fitness app, but I can't get information about Intervals. My idea is to show interval details when users view their completed custom interval workout plans. Can I use Healthkit (or another feasible method) to get the actual distance or time of exercise in intervals workout ? (I know the workoutPlan property, but it doesn't reflect the segments of a real interval training workout.) Any insights or suggestions would be greatly appreciated! Thanks in advance!
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How to monitor heart rate in background without affecting Activity Rings?
I'm developing a watchOS nap app that detects when the user falls asleep by monitoring heart rate changes. == Technical Implementation == HKWorkoutSession (.mindAndBody) for background execution HKAnchoredObjectQuery for real-time heart rate data CoreMotion for movement detection == Battery Considerations == Heart rate monitoring ONLY active when user explicitly starts a session Monitoring continues until user is awakened OR 60-minute limit is reached If no sleep detected within 60 minutes, session auto-ends (user may have abandoned or forgotten to stop) App displays clear UI indicating monitoring is active Typical session: 15-30 minutes, keeping battery usage minimal == The Problem == HKWorkoutSession affects Activity Rings during the session. Users receive "Exercise goal reached" notifications while resting — confusing. == What I've Tried == Not using HKLiveWorkoutBuilder → Activity Rings still affected Using builder but not calling finishWorkout() (per https://developer.apple.com/forums/thread/780220) → Activity Rings still affected WKExtendedRuntimeSession (self-care type) (per https://developer.apple.com/forums/thread/721077) → Only ~10 min runtime, need up to 60 min HKObserverQuery + enableBackgroundDelivery (per https://developer.apple.com/forums/thread/779101) → ~4 updates/hour, too slow for real-time detection Audio background session for continuous processing (suggested in https://developer.apple.com/forums/thread/130287) → Concerned about App Store rejection for non-audio app; if official approves this technical route, I can implement in this direction Some online resources mention "Health Monitoring Entitlement" from WWDC 2019 Session 251, but I could not find any official documentation for this entitlement. Apple Developer Support also confirmed they cannot locate it? == My Question == Is there any supported way to: Monitor heart rate in background for up to 60 minutes WITHOUT affecting Activity Rings or creating workout records? If this requires a special entitlement or API access, please advise on the application process. Or allow me to submit a code-level support request. Any guidance would be greatly appreciated. Thank you!
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How to detect when Apple Watch is removed from wrist during active workout session?
I'm currently collecting real-time heart rate data using HKWorkoutSession. I want to track when the Apple Watch is physically removed from the user's wrist during an active workout. However, I've noticed that workoutBuilder(_:didCollectDataOf:) continues to be called even after the watch is removed from the wrist. Is there a way to detect when the Apple Watch is removed from the wrist during an active HKWorkoutSession? Or is this tracking not possible through the HealthKit framework? Any guidance or alternative approaches would be appreciated.
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2d
Stands not detected
I have FB12696743 open since July 21, 2023 and this happened again today. I get home at approx 10 mins after the hour, walk appox 50 ft across my yard, up 5 steps into my house, let the dog out and pace on my deck watching the dog, go back in the house walk around the kitchen while preparing dinner. A total of about 200 ft. I sit down about 35 past the hour and start to eat and at 10 mins to the next our and I get the reminder to stand. On the other side I wake up at 5 mins to hour. Walk 8 steps to the bathroom and successfully achieve the stand for that hour. WHY!?!?!? 😁🤣
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533
Jun ’25
Change displayed metric in Fitness app
Good afternoon, I am working on a workout tracking app. So far everything is working as expected. However, I note that when my workout saves and is visible within the Fitness App, the workout duration is displayed rather than the kCal burned. What changes are required to be made in order for this to display the kCal in the list of workouts in Fitness rather than duration? For reference https://developer.apple.com/videos/play/wwdc2021/10009 this was my reference source for workout functionality.
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941
Jan ’25
Workout not showing for import on Strava
I have a workout app which I am testing on device currently via TestFlight. The generated workout (tennis and indoor) shows in the fitness app with correct HR and duration. However, when I go to my Strava app, it does not show in the list of workouts for importing. (note, activities tracked using the regular tennis mode on the Apple Watch show fine) I have also concurrently reached out to Strava support to see if there's anything they can offer support for. However, does anybody here have any knowledge/experience of the requirement? Or whether this is a limitation of an application deployed via TestFlight? I have a terrible feeling I am chasing ghosts, and it may be a TestFlight limitation for exporting workouts? Thanks
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901
Jan ’25
Can't properly check if Health Kit is authorized.
In my WatchOS app I've written the following code to check if my app has access to the user's health data: func isHealthKitAuthorized() -> Bool { let typesToRead: [HKObjectType] = [ HKObjectType.quantityType(forIdentifier: .heartRate)!, HKObjectType.quantityType(forIdentifier: .activeEnergyBurned)!, HKObjectType.quantityType(forIdentifier: .appleMoveTime)!, HKObjectType.quantityType(forIdentifier: .appleExerciseTime)!, HKObjectType.workoutType() ] let typesToShare: Set<HKSampleType> = [ HKObjectType.workoutType(), HKObjectType.quantityType(forIdentifier: .activeEnergyBurned)!, HKObjectType.quantityType(forIdentifier: .heartRate)! ] var isAuthorized = true for type in typesToRead { let status = healthStore.authorizationStatus(for: type) if status != .sharingAuthorized { print("Access denied to: \(type.identifier)") isAuthorized = false } } for type in typesToShare { let status = healthStore.authorizationStatus(for: type) if status != .sharingAuthorized { print("Access denied to: \(type.identifier)") isAuthorized = false } } return isAuthorized } However for the appleMoveTime and appleExerciseTime types their status is returning as 'sharingDenied' (checked by printing the status' rawValue) even though they are authorized on the Watch's settings. This happened both on the simulator and on the Watch itself. Am I doing something wrong?
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838
Jan ’25
Can I use an HKQueryAnchor across multiple devices?
Hello, I am currently working on an app that uses HealthKit to sync health data to a backend server that performs analysis on this data. I am keeping track of the synced data with the HKQueryAnchor I receive for each query I make. I want to address an edge case: if a user has multiple devices running the app, would it make sense to store the anchor on my backend? This would ensure that other instances of the app do not sync data that has already been synced from another device. Thank you for your help!
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828
Jan ’25
Apple Watch Ultra 2 having issues with heart rate measurements
I am using a new Apple Watch Ultra 2 (MX5R3LW/A) running WatchOS 11.3 (22S553). I noticed that the watch often misses heart measurements during meaningfully long segments of exercise sessions. This has been bugging me for a while and today I read an article that described perfectly, and much better than I could, what I am experiencing. Here is the article: https://apple.news/AK_QJyoLaQ1eaeySWHlkLPw Is this a known issue that is being worked? Thanks.
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Jan ’25
Workout Types to be Added to Apple Watch
Dear Apple Developers, Could you kindly add the two following workout types to your Apple Watch? There are large communities that participate in both of these activities globally. Rucking workout option. goruck.com TRX suspension trainer option. trxtraining.com Thank you for your consideration. This addition will make many people happy.
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362
Jan ’25
HealthKit: Seeking Guidance on Continuous, Near Real-Time Heart Rate Data Conitnously in IOS Application
Dear Apple Developer Support, I am writing to request assistance with an ongoing issue I'm encountering while developing an iOS application that utilizes HealthKit to fetch heart rate data. My goal is to display near real-time heart rate updates continuously same as displaying in the Apple Watch , I want to show in the iPhone Mobile Application for fitness related. I have implemented the following approaches: HKSampleQuery with a Timer: I've set up a timer to periodically fetch the latest heart rate data. Despite these efforts, I'm consistently facing the following problems: Delayed Updates: The heart rate data displayed in the app often doesn't reflect the current heart rate being measured by the Apple Watch. There seems to be a significant synchronization delay. Inconsistent Background Updates: Background updates, even with background app refresh enabled, are not reliable. The app often only updates when brought to the foreground or after being killed and relaunched. Entitlements: The com.apple.developer.healthkit.background-delivery entitlement error is missing. I have thoroughly reviewed Apple's HealthKit documentation, implemented best practices for HealthKit integration, and verified that all necessary permissions are properly configured. I understand that HealthKit may not be designed for true real-time data, but the current level of delay and inconsistency is making it difficult to provide a useful user experience. Could you please provide guidance on whether achieving near real-time heart rate updates continuously in an iOS app using HealthKit is possible? If so, what are the recommended strategies and best practices to overcome these limitations? I have also tested the application on physical devices with Apple Watch, enabled background app refresh, granted permissions, and referred to HealthKit documentation. I would appreciate any insights or suggestions you can offer to help resolve this issue. Thank you for your time and assistance. Sincerely, Venu Madhav
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743
Feb ’25
Is it possible to provide an interface for real-time sleep status monitoring
Apple Watch automatically tracks sleep data and syncs it to the iPhone, making it available through HealthKit for historical analysis. However, there is no way to retrieve real-time data on whether a user has entered sleep, or whether they are in a specific sleep stage at any given moment. Is it possible to provide an interface for real-time sleep status monitoring
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598
Feb ’25
Request for Guidance on Cross-Platform Heart Rate Data Sharing
Dear Apple Developer Support, I hope this message finds you well. I am reaching out for guidance on a project that involves sharing heart rate data between an iOS app and an Android app. I have developed a watchOS app that continuously fetches heart rate data from an Apple Watch and displays it in a companion iOS app. Additionally, I have built an Android fitness app using Ionic Angular. My goal is to create a bridge that allows the heart rate data from the iOS app to be displayed continuously in the Android app. I am considering using a backend server (e.g., Node.js) to facilitate this data transfer. Could you please provide any insights or recommendations on the best approach for achieving this cross-platform data sharing? I would appreciate any guidance on potential challenges or limitations I might encounter. Thank you for your time and assistance. Sincerely, Venu Madhav
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492
Feb ’25