This is not a question about an impact hammer.
Does it help to hit a bolt with a regular steel hammer, before even attempting to remove it?
I saw this done in the following video:
https://youtu.be/-DSuc2a_Y_M?t=1946
(should start at 32:26)
I'm aware of using heat and penetrating oil as well-known tricks that should help. My question is, is there any merit to this particular technique, the hammer?