I see and hear a phrase like this often, mostly applied to advanced follows: "Just look at her poor posture! She's thrusting her butt out. Tsk tsk." The implication is that it's a style designed to look sexy at the expense of your back. But having a prominent posterior actually is good posture! "...if you look at drawings from Leonardo da Vinci — or a Gray's Anatomy book from 1901 — the spine isn't shaped like a sharp, curvy S. It's much flatter, all the way down the back. Then at the bottom, it curves to stick the buttocks out. So the spine looks more like the letter J." - From NPR. Here's a link. Look at the spine shapes of the statues: My theory is that we've gotten so used to seeing a tucked pelvis-posture in our modern, sitting-prominent world that good posture can look strange to us sometimes. Also, keep in mind some countries' populations just tend to have more badonkadonk. Also, think about it it...why would so many professional dancers who dance hundreds of hours a month assume a posture that would cause them pain? Granted, some DO have exaggerated postures, but it is due to the exaggerated "S" shaped spine and not the derriere. Here's someone with a good, "J" shaped spine: And a more exaggerated "S" spine: Note that in both cases the backside is prominent, but if you look at the lines they're actually quite different.