The Move Reminder (or Change Position Reminder) app helps you avoid back pain by reminding you to change your working positions throughout the workday. Basically, it's a Move reminder based on a timer instead of steps.

Closing the app or opening another app will stop the timer, and the alarm will not go off as scheduled. If the timer is started, the app will be active even if the screen turns off.

Once you start the timer, it will buzz every set number of minutes to remind you to start working in a standup or sit-down position, depending on the setting. You pause the timer and/or close the app at the end of the workday to stop any further reminders.

The app is 6$ (lifetime access) with a 14 days trial period.