Where are you EFLing? Where do you EFL?
Don't you think that the process, at the start, is one of walking and then doing a bit a crawling. It's not just full-fledged walking.
But I think that the main reason is that using the present continuous form simply makes it much more vivid than the present simple.
I don't know that you're going to make a career of teaching EFL/ESL but I can ask using either form.