Best keepable gains

Well I posted this as I started earlier a thread about something related wether gains from pe are permenant or not and well I realised permenant or not a short maintenance routine wouldn’t hurt,now the real question is what kind of routine will produce gains which are more keepable,hanging? Manual stretches ,jelging?thanks

So can anyone give me his feedback,does keepability of gains from different exercises vary,does it even matter ?

I don’t think it matters much, maintenance routine is needed for hanging as well for stretching and jelqing.