Yeah but everybody can't be brolic though, not saying hardwork won't get you where you want to get but if Katy Hearn wrote her azz workouts and put it out there for 100 females to do and they followed everything she did to get her azz some would improve, some would match her azz, some would surpass her and some would see limited success. Genetics, body type etc play a big part in how we respond to exercise and how are bodies are altered from said exercise.
But bruh, what I'm telling you is genetically SHE HAD NO ASS...
She was as flat as you could get and she grinded until she made her lil ass as bubbly as it could be
and you right genetics could play a part on how your body responds to exercise but that's usually in a sense of how fast you gain muscle, how fast you lose weight, how naturally you are shaped, etc..
Anybody can be a bodybuilder regardless of genetics is more about how hard you work. This chick goes hard about her lower body and trained it to have an ass like that
Just like white girl in the OP... But I don't even think she goes as hard as Katy with the ass workouts