"Breast bounce" refers to animation that depicts a woman's breasts as bouncing or jiggling in a realistic manner. It is an effect intended to imply more female sexuality. With each step a woman takes, her breasts move an average of 9 cm - not just up and down, but also sideways - in a figure of eight motion. When she breaks into a run, they move up to 15 cm with each stride, if unconstrained by a bra.