Theory of hard gainer
As all you know, the first inch you gain is from the lengthening of ligament in your penis. But why do some people (example: me) take longer to get that newbie gains while some of you only need 3 months to get more than half a inch?
I am thinking about the toughness of ligament which varied within the population. Our joints are surrounded by ligaments,and the only way to make yourself flexible is to stretch out the ligament. I do different kind of martial arts and I realize that it takes more effort for me to build up my flexibility. The only good thing about this is that I when I do Brazilian jujitsu, even though I got a nasty joint locks and hurt myself, it heals and the pain goes away within a few hours. In addition, when I get older my joints will probably still strong compare to other older people.
In conclusion, my theory is that your joint flexibility will indicate how easy you will get your newbie gain. If you are flexible in nature, you could do mild training or even one day on one day off routine and still manage to gain. While not so flexible people like us, we have to have a heavier routine to get decent gains, but it also become more difficult for us to over train.
Chime in if you are hard gainer, easy gainer, or anything else you agree or disagree. Thanks people!