Just watch most women's (semi)professional sports and Olympics. The more fit/buff they are, the lower the body fat. The lower the body fat the tighter the package all around, including breasts. You don't see buff high level athletes with size F boobs, as it's not feasible unless they are fake. I like to see some semblance of proportionality reflected in games centered around sports/fitness. With her fitness level, I think the balance on her entire physique is just perfect.