Our skeletal, muscular and nervous systems remember everything that we do and how we do it. If I carry my purse on my right shoulder for years, not only will I lean more on my right side, but my shoulders will eventually become uneven. If Stella walks with an arched back while wearing heels because she thinks it makes her look more attractive and taller, her body will remember her movements and become accustomed to her walking with an arched back when she wears heels. She might feel pain, she might not (yet). But the harm that she is causing her body by repeating those activities will become evident in her posture.