I recently got my Mum a Garmin lily as she is an extremely active 70 yo. However, it doesn't seem to be recording Intensity Minutes properly. She does gym, badminton, hiking, everyday so I was expecting her to be smashing the 150 target. The graph shows her HR today during badminton, which was Zones 3 and 4 for almost an hour, but didn't give any intensity minutes at all. It wasn't a recorded activity, but that doesn't matter as the HR is always active.
Her HR zones are set up correctly, based on Max of 143.
Her activity class is set to level 5.
Is it because she has to low'ish resting HR of 53 ?