The Move ring will count time under two conditions:
- Your heart rate is above a certain threshold even if you did not start a workout
- You started a workout and your heart rate is above a certain threshold.
I have found that for things like leisurely walks, when I start a walking workout, I normally don’t get a 1:1 reporting because a leisurely walk rarely gets my heart rate high enough to count towards exercise. I may do a 30 minute walking activity, but only get credit for about 15 minutes.
On the flip-side I sometimes get a fair bit of Exercise minutes even when I’m not recording an activity because my heart rate was high enough.
The rationale is, I gather, that just simply turning on an Activity isn’t enough, you actually have to move vigorously enough to elevate your heart rate sufficiently for it to count as exercise, which makes sense.