We don’t know for sure what the limit is, or if there is one. Unfortunately we don’t have photo proof of the 4” gains (I may be incorrect about the actual amount they reported) of Yguy and Bib, so one must decide for oneself whether to believe it or not. I’m not saying it didn’t happen, in fact I think it’s likely they told the truth, but we don’t know for fact. Both reported putting mega effort into it and even though I’ve only put a fraction of their effort into it I’ve gained 1 1/4 in length and 1/4 in girth. And I don’t have proof to present either. So even though 4” is highly unusual, their level of effort was unusual. So perhaps.
Gains such as mine, or gains of a bit less, are numerous, and there are even a few members’ photos of such gains. Proof enough it works. Gains such as Bib’s and Yguy’s are rare. From reports it appears that making it to 2” gains in length is a decent possibility with lots of time and effort, but if one is a ‘hard gainer’ (term we use for those that have a tougher time than usual achieving gains) 2” in gains might not be possible. I say ‘might’. It also appears that anything past 2” gets extremely tough to achieve for just about anyone. I’ve been typing about length, but girth gains of 2” are unusual also. Big Girtha gained 2” in girth and gave us such detailed information every step of the way of his gains for a long time that I for one do definitely believe him and I think you would be hard pressed to find a member that followed his progress that doesn’t believe him. He had trouble with gaining length though, though I think I recall he did gain some. He worked on girth almost 24/7 nonstop for two years. It battered his dick up but he achieved the girth gains he was after. Bib reported being obsessed with gaining and that does help me in believing him. It does appear that with time and effort the chance of success corresponds. It also appears that whether one is an easy gainer, moderate gainer, or hard gainer plays a role.