Re: getting this bad habit removed!
The popup is actually a two step process, the back foot goes down first and the front foot second, we just do it so fast that it seems both go down at the same time. If you keep that in mind and try to exagerate it you should be able to land your feet spread appart.
Second, if your feet are together then I'm going to assume that also, by mistake, you are facing forward. Remember that the body has to be sideways, landing facing forward will result in you falling backwards.