I was trying to explain this to someone and it occurred to me that it might be something strange I learned...
Whenever I use regular sandpaper, I "Break" it by drawing it across a sharp edge (workbench edge for example) I pull it across a couple of times in different orientations to flex the paper and crack the adhesive.
IIRC I was told to do this in woodworking class perhaps in 7th grade.
From what I can tell it makes the sandpaper last longer by making it harder to load up and preventing the grit from coming off in chunks.
Do you do this? What do you call it?