There are instances where we see that Apple Health App rolls back step totals after reporting it sometimes within a few minutes and other times within a few hours. There are a few reasons for this
The Health app on your iPhone combines health and fitness data from Apple Watch, iPhone and any other data sources.
When doing so, it automatically adjusts the reported results to avoid any double-counting of the same type of data for the same period from different sources.
In order to mitigate this issue we would like to suggest following the steps below.
1. Update Apple Watch & Phone to the latest version
2. Recalibrating Apple Watch to improve accuracy
It would be good practice to Restart your Apple Watch & Phone too.
1. Update Apple Watch & Phone to the latest version
You can get the latest version of watchOS directly on your Apple Watch, or use your iPhone to update.
Check your Apple Watch compatibility
First, make sure that your Apple Watch works with the latest software. watchOS 9 is compatible with these Apple Watch models:
- Apple Watch Series 4 and later
- Apple Watch SE (1st generation) and later
- Apple Watch Ultra
Updating to watchOS 9 also requires one of these iPhone models:
- iPhone 8 or later with iOS 16
- iPhone SE (2nd generation) or later with iOS 16
If your Apple Watch isn't compatible with the latest version of watchOS, Software Update will show you the newest version that your watch can use.
Identify which Apple Watch or iPhone model you have.
Get ready to update
Next, check these things:
- Make sure that your iPhone is updated to the latest version of iOS.
- Make sure that your Apple Watch is at least 50 percent charged.
- Make sure that your iPhone is connected to Wi-Fi.
Keep your iPhone near your Apple Watch throughout the update. It could take from several minutes to an hour for the update to complete, so you might want to update overnight or wait until you have time.
Update your Apple Watch using your iPhone
You can wait until Apple Watch notifies you when a new update is available. Tap Update Tonight in the notification, then go to your iPhone to confirm that you want to update overnight. At the end of the day, leave your Apple Watch and iPhone charging overnight so the update can complete.
Or you can update your Apple Watch with your iPhone manually:
- On your iPhone, open the Apple Watch app, then tap the My Watch tab.
- Tap General > Software Update.
- Download the update. If asked for your iPhone passcode or Apple Watch passcode, enter it.
- Wait for the progress wheel to appear on your Apple Watch. It could take from several minutes to an hour for the update to complete.
Leave your Apple Watch on its charger while the update completes. Don't restart your iPhone or Apple Watch, and don't quit the Apple Watch app. When the update completes, your Apple Watch restarts on its own.
Update directly on your Apple Watch
If your Apple Watch has watchOS 6 or later, you can install updates without your iPhone:
- Make sure that your watch is connected to Wi-Fi.
- On your watch, open the Settings app.
- Tap General > Software Update.
- Tap Install if a software update is available, then follow the onscreen instructions.
Leave your Apple Watch on its charger while the update completes, and don't restart your Apple Watch. When the update completes, your Apple Watch restarts on its own.
2. Recalibrating Apple Watch to Improve Accuracy
You can calibrate your Apple Watch to improve the accuracy of your distance, pace, and calorie measurements. Calibrating your watch can also help it learn your fitness level and stride, which improves accuracy when GPS is limited or unavailable.
Check your settings
To make sure that your Apple Watch can get the information it needs, check these settings on your iPhone:
- On your iPhone, open the Settings app.
- Tap Privacy & Security > Location Services.
- Make sure that Location Services is turned on.
- Scroll down, then tap System Services.
- Make sure that Motion Calibration & Distance is turned on.
- Continue with the steps below.
Calibrate your Apple Watch
- While wearing your Apple Watch, go to a flat, open outdoor area that offers good GPS reception and clear skies.
- If you have Apple Watch Series 2 or later, you just need your Apple Watch.* If you have Apple Watch Series 1 or earlier, bring your iPhone for GPS. Hold your iPhone in your hand, or wear it on an armband or waistband.
- Open the Workout app, then tap Outdoor Walk or Outdoor Run. To set a goal before starting, tap .
- Walk or run at your normal pace for about 20 minutes.
If you don't have time to finish the workout, you can complete 20 minutes over multiple outdoor Workout sessions. If you work out at different speeds, you should also calibrate for 20 minutes at each of the speeds that you walk or run.
Whenever you walk or run outside using the above steps, your Apple Watch continues to calibrate the accelerometer by learning your stride length at different speeds. Calibration can also improve the accuracy of your calorie calculations in the Workout app, and the calorie, distance, Move, and Exercise calculations in the Activity app.
Improve your Workout and Activity accuracy
Your personal information, such as your height, weight, gender, and age, is one of the things your Apple Watch uses to calculate how many calories you burn and more. Learn how to update your personal information.
Reset your calibration data
Here's how to reset your calibration data:
- On your iPhone, open the Watch app.
- Tap the My Watch tab, then tap Privacy > Reset Fitness Calibration Data.
* Apple Watch Ultra, Series 8, and SE (2nd generation) use the built-in Apple Watch GPS even when your iPhone is nearby. To preserve battery life, older Apple Watch models use the GPS from your iPhone when available.
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