The process outlined above is a mild version of binding. If the girl was a little older when her feet were first bound, a more extreme form of binding would be used. For example, the girl's toes and arches would be broken, and then the foot was folded and the front of the foot was forced towards the heel. The girl would suffer extreme pain from this.
Once the foot was folded like that, the feet would be bound tightly, once again causing extreme foot pain. However much pain she was feeling, the girl was required to walk on her newly broken and bound feet, in order to grind and crush the foot bones even further. And that was just the beginning.