How can I add a reminder to stand up and sit down without stopping working?

A customer asked how to add a reminder to stand up and sit down, without blocking them from working, in the /r/Dejal community on Reddit:

I want to use time out to automatically start a 45 min timer when i log in , and after that time display a message stand up (but let me continue working), and then once i stood up for 15 minutes display a message sit down. (total time 60 min) one cycle. this i want to repeat all time i am working in the computer. is this possible?

I know where to set the message, but if i set the time out to 15 minutes, it doesn’t let me continue work during those 15 minutes, as it freezes the screen.

The easiest way to achieve this is to use a single break that has a duration of zero (which doesn’t dim the screen when the break is due), and a freqeuncy of every 1 hour:

Then add a couple of notifications on the Break Actions page; one 15 minutes Before Due to say to stand up, and another zero minutes Before Due to say to sit down:

This will show the “stand up” notification after 45 minutes, then the “sit down” notification 15 minutes later, and repeat throughout the day.