A free app for Android, by PANTERRA.
Work Break - Break Reminder, Timer and Scheduler is a simple and easy to use solution for those who need to schedule breaks and rest during their workdays. With this app, you can easily be reminded when to rest and when to work, which will help you to maximize your productivity and keep your body and mind healthy.
The application has a simple interface, and you can customize it according to your needs. You can set reminders for the time you want to rest and for the time you need to work, and you can also set a reminder to drink water.