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yeah I started doing that for a little bit when I first got the board, just standing on the board on the carpet in the hall and pretending to push whilst standing and bending the front leg. My knee stability isn't the greatest (previous non skating injuries) so I could do with building up the strength in them anyways, without having to resort to buying, a balance board or similar.
I've seen in a few places people talking about balancing one-footed on the board (and building up the length of time you can do that), as a decent beginner exercise. My balance is generally pretty good but I can't get anywhere near 30 seconds on the board yet!