The thing Aaron Donald when you look at him is that he has the ideal football players body (nh) I mean yes he is built in his upper body but you can tell he probably has most of his muscle mass in his upper body in his traps and back, in other words not only does he have a lot of muscle but none of it is wasted or for show. Also, he carries most of his weight in his thighs, buttocks, and calfs which explains how he is able to explode of the line. But that build is mostly genetics.
My family on my fathers side is somewhat built like that where they were like 5'9-6'1 but thick with long arms.