What are the timer programs for those who work at the computer?

Question

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Doctors recommend that the posture does not deteriorate once an hour to get up from the computer and warm up.
In this regard, the timer program is of interest, so that it automatically makes itself felt once every N minutes. The problem with those timers that I went through is that they really do. And you need to count the time from the moment the activity at the computer began, and if there is no activity for a long time (for example, 5 minutes), then reset the timer.
Is there such a solution?

Answer 1

Easiest without resetting the timer
sleep 25m ; notify-send "stand up" "and do stuff"

Answer 2

motivateclock.org