I get not wanting to be cooped up inside all the time, and if walking is what you have to do to get place to place then I suppose it would fall under exercise unless you are walking more than 4 mi daily, that's a bit excessive to just be considered what you need to do to get by. I think there is a fine line between exercise vs. purging exercise and it's different for everyone. I mean, if I walked 4 mi to get places, it would be purging for me as I have a car and secondly, the only place I can easily walk to is Walgreens (which is like a quarter mile at most). There are no sidewalks, no bus stops, etc as walking places is not encouraged around here. If I walk 4 miles, it's exercise for me simply because I wouldn't be going anywhere except all over my suburb, and if I didn't eat enough calories to support that it would be purging. I don't know if that makes sense? Have you ever consulted a dietician as to how many calories you need to eat daily? It works out differently for everyone depending on your activity level and if you need to gain weight, lose, or maintain.

@Autumn88 Welcome!