Could Monzon really not train and have that Stamina, Myth?

My brother's 25, so we'll see what happens with that. I didn't mention that when he isn't drinking it up on vacation he's usually busting his ass at the gym. I hardly ever work out, but it's in the genes. Then again I'm not on the same level as he when it comes to fitness.

 

Envious of such. Never had great innate stamina. Always was tougher of me to get into shape. And plenty of other people seemed to have respectable natural stamina without having done **** (My brother).

 

However Monzon trained, it was, as noted before, that he didn't kill himself in sparring wars. He felt that many fighters, especially American fighters, left the better part of themselves in the gym due to too much sparring. He knew how to navigate the 15 round distance as well as any fighter in history, whether he cut down to a pack a day or not.