I made this account just to tell you that i can hold that pose, you're all exaggerating a ton regarding how hard it is to hold it.
If anyone can show me a photo of an actual human holding that pose with their butt at that angle, then I'll believe you. Otherwise I'm assuming you've half-assed it.
Look at the shoulder. It's behind her butt.
Of course, I'd also challenge you to hold that pose while wearing armour, but I understand that can be a little difficult to obtain.
It is most definitely not unrealistic. I won't go as far as to post a picture of myself on here, but the google search there should be all that you need.
