20 Dec The twerk describes a move most unnatural, where the twerker gyrates their hips around in a combination of twisting and jerking. I have heard. 27 Aug What makes a twerk, a twerk? a great work out for the butt, thighs, deep muscles of the hips, core muscles of the lower back and abdominals. 27 Aug "I haven't really seen one bad comment about my twerk video," Miley said . as well the deep muscles of the hips, lower back muscles and abs.