All Garmin watches and bike computers export standard FIT files. Export from Garmin Connect, import into the editor, add overlays.
Export your FIT file from Garmin Connect: web → Activities → select activity → gear icon → Export Original. Mobile app: activity → three-dot menu → Export Original. USB: device → Garmin/Activity folder.
MetricsOverlay reads every data channel Garmin records: heart rate, speed, pace, cadence, power (from paired sensors), altitude, temperature, and GPS.
Garmin Edge bike computers use the same FIT format. Power from Rally pedals or paired meters comes through identically.
Always use "Export Original" to get the .fit file. TCX and GPX exports lose data fields.