Hi
To credit progress towards your daily Exercise goal, the Activity app aims to identify activity that equals or exceeds the intensity of a brisk walk.
This applies both during general daily wear and when recording workouts via the Workout app. It is possible that not all of your workout met this requirement.
The definition of a brisk walk varies from person to person and depends upon your personal information. To check that your personal information is accurate - and to update it over time:
- On your iPhone, in the Watch app, go to: My Watch (tab) > Health > Edit - tap and adjust items, then tap on Done.
During general daily wear and when your iPhone is not taken along on certain outdoor workouts, the Activity app relies on your arm motion (measured by the accelerometer) to track movement for the purpose of crediting progress towards the Exercise goal. For the best results, allow the arm on which you are wearing your watch to swing naturally as you move around and during workouts.
For outdoor walks, if you take your iPhone along (with Location Services enabled), the watch can also use GPS data from your iPhone when estimating pace and distance. (Exercise credit will still only be awarded for minutes when the brisk walk requirement is met or exceeded).
Calibrating your watch can improve the accuracy of various estimations (including Exercise credit) made by the Activity app and Workout app. More information and instructions for calibrating your watch are available via the link below.
More information:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Use the Activity app on your Apple Watch - Apple Support
Use the Workout app on your Apple Watch - Apple Support