Just want to say that, as a former gymnast of a decent amount of skill, that yes, I could (in my youth
) strike that pose.
And it's very uncomfortable to lean and curve the spine that much. It's by no means a 'natural' position in which to stand.
As a former SCA fighter who has gone sword and board in combat? That's a dumbass way to stand. Defensive positions usually involve the spine curving the other way, tucking in rather than bowing out. I know this is super strong WW we're talking about, but using the muscles in the back to curve the spine in the manner she is doing while bending slightly forward at the waist is putting muscles in the direct opposition to the blocking with a shield from that angle. The right leg is crossed over in front of the left leg, preparing for a possible pivot to the left, but the balance is all wrong (and one of the basics of footwork, both in medieval combat as well as fencing, is never to cross your feet as it makes it very easy to trip up/lose your balance)
In other words, it doesn't serve any purpose either from a gymnastic perspective or a combat one. It's there just to stick her butt out and flash her cleavage at the same time.
As a woman, I think it's stupid.