Sophie sort of half raised her hand then started nodding. "Walking." Yup "I'm going with that one. You can't get much earlier than good old primitive walking around," she said.

There really wasn't much else she could say. Walking was pretty much common knowledge with everybody alive, so there wasn't anything to add or enlighten anybody on.

Yup, walking. She was sticking with that. Nevermind the fact that these days, she seemed to be walking waaaaaaay slower than usual. Maybe she just needed more exercise. Quidditch should help.