>>232266924try it for yourself. if you can't do a split i wouldn't advise it, but that pose is entirely possible. you also need to account for the viewer's perspective, how the leg appears with respect to you and how it's attached to the hip.
if you have a floor-length mirror, just do a simple slav squat in front of it, with your knees as far apart as they can go before you pull something, then look at the angle they make with the hip.
her right hip is on the ground, that knee is exactly where it should be. her torso is flat on the ground, she's not even bent 90 degrees at the waist.
i dont even read this manga and watching people be dumbfucks about how the human body works is pissing me off