Vivace
I’m uncertain if you are serious or ingratiating. :) But just in case i’ll bite and create a stir.lol
I believe that if a person figures out how to pump for his own individual self aa well as executes the proper techniques to cement his gains , then yes!, pumping is capable of producing permanent gains.
The same can go for manual exercises. And those who may be gainers and say they can’t may simply be missing the mark somehow, although some apparently are no gainers.
Yet i completely fail to understand why some can’t gain in girth, which is the easier of the two main ways to gain.
[Successful pumping is determined by the practitioner and not the inanimate object].