Is it true that harddisks need to me used once on a while to stay alive?

Is it true that harddisks need to me used once on a while to stay alive?

I have heard someone saying that someone else said hard-disks need to be
"moved" once in a while meaning it has to spin or data has to read or
written to once in a while or something like that.
I am thinking about a external harddisk just as backup, and I will
probably only move data on there every 6 month or so. The other time it
will sitting in a "save place" somewhere powered off. I guess thats
perfectly fine.
I could image this somehow to be true since there is something with
magnetic force going on inside ... and that some persistent conditions
might be bad for it, that the data might "fade" or something.
But just assuming I would never use the Disk in 2 Years is it bad for it
to never used in all that time? Or is this just a Myth? Will its live
expectancy actually be better that way or worse?
And I by the way know that Hard-disks are not the Professional way for
long time backup. So please stay on topic.