Use APKPure App
Get Take Your Marks - for swimmers old version APK for Android
Start practice app for swimmers. Very simple and easy to use.
This is the app for start practice for swimmers.
When you push start button,
(Whistle) -> "Take your marks" -> (Start Sound)
is playing.
The interval between "Take your marks" and "Start Sound" is randomly set.
Noise can be running. You can practice in a competition environment.