Cardio Fitness doesn't have Apple Watch as a data source

I update my iphone and apple watch yesterday. But the cardio fitness says no data. When I checked I noticed that it does not have any datasources. My Apple Watch was not added automatically. I cannot find a way to add it manually as well. What can be done?

I thought of unpairing and pairing again. But then it will not have my previous data right?

Apple Watch Sport

Posted on Dec 16, 2020 4:46 AM

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Posted on Jan 15, 2021 3:29 PM

The cardiofittness function needs the heartbeat and the distance to determine a value. If the energy saving mode is activated for training in the watch settings, no heart rate is recorded. Therefore deactivate the settings in training / energy saving mode in the Apple Watch APP on the iPhone. Then check in the iPhone settings whether the GPS mode is activated for training settings / privacy / location services / training sessions. You can then reset the calibration of the watch in the watch app on the iPhone under Privacy. Now you need to exercise outdoors for at least 20 minutes while walking or running. This is required for recalibration. It is also possible that values ​​under Cardio are only displayed after several training sessions. The cardio fitness function only works outdoors because otherwise the GPS data for the distance is missing. No cardio data is recorded for indoor training, e.g. steppers or yoga.


Greetings from Germany

182 replies

Dec 21, 2020 7:12 AM in response to dminiz

One thing nobody seems to be mentioning is that it seems to take some days for the reading to show up. I have had two watch pairings and the first time it took seven days before I got a cardio fitness reading. The second time it took three days. My advice then would be to wait at least seven days before concluding the feature isn't working. Before that point, you will not see your watch as a data source because it doesn't appear until the first reading writes the data.

Dec 21, 2020 1:54 PM in response to dminiz

Here is how I ‘fixed’ the issue on my watch.

The heart rate grey-ed out- turn off Power Reserve on the watch.

cardio Fitness not showing watch as resource— turn on location service

— on the phone in the watch app click on privacy, then on Reset Fitness calibration

  • now do Outside walk or run using walk/run App for about 15/20 min.

this fixed the issue for me

Dec 26, 2020 11:54 AM in response to PQC

I talked to an excellent support person at Apple and here is the fix.


First, you have to do at least a 20 minute walk OR run. I know we all know that.


However, Apple made a change recently in the iOS. Now for it to record Vo2 Max you have to run for 20 minutes at 10 mph. I can’t do that. So, if you record your workout as a walk and actually run for at least 20 minutes it will record it.


I actually recorded it through MapMyRun and it worked fine.


Hope this helps and Merry Christmas.

Dec 26, 2020 12:41 PM in response to dminiz

I had same problem. I have Series 3 Watch and iPhone 11Pro Max, both updated to latest software. As someone else pointed out, you must initiate OUTDOOR walk or run WORKOUT via the watch “workout app” only. You must do 2 workouts- (I did 1 workout on a Monday and the other on a Thursday-in the same week) before it calibrated and updated the Cardio Fitness statistics in the HEART APP. Hope this makes sense and hope this helps!

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Cardio Fitness doesn't have Apple Watch as a data source

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