I built Pitch Pulse as a focused soccer and football training app for Garmin. It records a Soccer FIT activity and shows elapsed time, GPS distance, heart rate, current speed, maximum speed and an automatic estimated sprint count. The sprint speed threshold is configurable, and BACK/LAP marks periods.
Pitch Pulse works without an account, phone connection, ads or an external server. Location, heart rate and activity data stay on the Garmin device and in Garmin Connect; ProWatchs has no server access to them.
Sprint counts and GPS metrics are estimates rather than professional performance analysis. The app is intended for training and amateur play, and players should follow local rules about wearing a watch or jewelry.
I am the developer. Every feature is free on Connect IQ:
apps.garmin.com/.../693b6f51-85ac-4593-9164-fd375c30b1ec
If you try it, device-specific feedback is very welcome.