This falls off precipitously an hour before sunset or in totally cloudy and overcast conditions.
For running, Epix 2 had instant pace that was better than other recent Garmins but still not as accurate as a footpod like.
You can then obtain an evaluation on which muscle groups were used and to what extent.
Training Status lets me know how effective Garmin believes my training to be, whereas 4W Load Focus looks at how the different intensities of my training differ or match the ideal.
A strength workout animation on the Epix.
This likely means 4 years, in line with industry standards.