Setting blacks aside, since no one is going to argue that the better specimens of that race have ridiculous muscle building genes, yes, some people do have better genetics for building muscle, which is perhaps what you're referring to as "denser fiber." However, you're so myopically focused on the bodybuilding/drug culture, which is what you're experience is in, that you can't even comprehend this.
Look at any college football program. Some of the kids will be much "denser," stronger, etc., than others (at the same height). Those kids have better genetics to build muscle than other kids in the program. That's why some are linebackers and some are wide receivers. The kid who is 6'2" 235 and fairly lean is going to hold onto a lot more muscle if he dieted down than the kid who is 6'2" 185, even if the 185 kid is already lean.
fuck your dumb.
and what have those kids done a whole fuck of a lot more than you have since starting high school.
they've been training. creating the environment that forces their growth. those highschool kids train their asses off long before the get to college. 2 a days plus weight room work.
you go to the gym and train chest for 45 minutes then cry abt your. 'shit genetics for muscle building'
try to find a correlation between your post, how much work is involved and the adaptations necessary to meet the demands placed on the body.
don't debate me boy. I know I'm under your skin and that's why you follow me around the board snipping at my ankles when ever you can. just take your licks and move on and thank God and me for blessing your ignorant self with my knowledge.
apply it instead if concerning yourself w being butthurt by my means words that hurt your feelings at some point long ago.