Most of the videos don't have sound because the contributor muted it at the upload.
The main reasons are that the sound quality is bad due to the wind, but also because they sometimes talk and want to keep their discussion confidential.
However, coaching videos have sound as the coach gives instructions but also adds some music.
If you don't have sound in the app, make sure that :
- This video has sound
- You don"t have a physical 'mute' button ( especially on Apple devices )
- The volume is high enough in your sound settings.
- In the Kinomap app, you didn't mute some sounds: