Yeah black people tend to store more glycogen in their muscles (for speed and power) which is why it looks "fuller" but white muscle is denser and tends to have more contractile fibers.
The funny thing is, though, is blacks don't really compare to US whites in speed and power either. They're winning simply because whites don't want to compete in those sports anymore.
Every once in a while a white guy will get serious about one of those sports and end up dominating everyone else.
Do you see many Asians doing the same?
Every once in a while a white guy will get serious about one of those sports and end up dominating everyone else.