I have had multiple workout sessions this week, but only 21 minutes have recorded
I have had multiple workout sessions this week, but only 21 minutes have recorded
That's very well possible. Read why and when it can happen in the document How Does the Intensity Minutes Feature Work on My Garmin Watch?
Especially note the following sentence:
In order to earn intensity minutes credit, you must reach or exceed 10 consecutive minutes where either your step count rate or heart rate is elevated above the threshold that is considered moderate intensity.