^Imo abs are genetic. I find that smaller people in height have pretty good abs large and blocky, whilst taller not the same. Im fairly tall at 6ft my waist is tiny so I have a full six pack (under the flab
) but my abs are pretty small not large and blocky. Imo it can't really be altered as such, you can strengthen them and make them slightly bigger but it's down to genetics and body fat imo. My good mate who i'll be honest he never goes to the gym rarely anyway as he works a lot. Eats healthy tho but his body fat is very low but his arms and shoulders and back are nothing to write home about, his abs are INSANE. Ripped to shreds and blocky as hell. He never really goes to gym tho and has no set diet, eats roughly anything but quite healthy.
I don't really train abs either, Im always saying i'll do it after my workout but i never do lol.