Garmin has released a new update to numerous smartwatches in its fēnix series, including the fēnix 6. The update brings some major changes and improvements to the smartwatches, including adding support for HIIT workouts. Some Marq models also benefit from Garmin's extensive update.
https://www.notebookcheck.net/Garmin-Fresh-update-brings-new-features-and-improvements-to-several-smartwatches.593588.0.html