A lot of people have been waiting for this for years.
Physio TrueUp syncs activities done on other Garmin devices, allowing your device to more accurately reflect your training status and fitness. Activities from other devices will appear in the Activities menu, and they will update your Totals for Running, Cycling, and Swimming. Your Training Status, Training Load, and VO2 Max will be updated using activities from your other devices, and your Recovery Time will be also updated using data from other devices supporting Physio TrueUp. Enable Physio TrueUp in Settings > Physiological Metrics on the device or in Device Settings on Garmin Connect Mobile.
https://forums.garmin.com/forum/on-t...02-public-beta