Polar has started distributing firmware version 2.0.12 to the Polar Grit X, a nearly two-year-old smartwatch. The update adds some features to the smartwatch that Polar previously reserved for the more expensive Grit X Pro, including the ability to use the Grit X as a heart rate sensor on gym equipment.
https://www.notebookcheck.net/The-Polar-Grit-X-smartwatch-receives-new-features-from-the-Grit-X-Pro-with-firmware-2-0-12-update.594688.0.html