Thank you, my friend. When I saw your feedback and comments, I immediately clicked on your link, hoping to help you. However, I'm sorry to say that my phone doesn't support the version of your software. I apologize for that. If there's anything else I can do to help, please let me know.
Regarding the bug you mentioned, I'm not sure if I understood correctly. Are you saying that the navigation bar disappears after you click "start exercise"? Or does the interface freeze after you click "finish exercise"?
could you please tell me the API level and Android version of your phone? I'll start looking into this issue.
sorry again, my friend
