I have middle age spread although the rest of me is skinny and quite toned- I walk a lot.
Recently I have started working on my gut and have cut down on carbs, stopped with wine during the week, small regular meals and no carbs after 6.
However I feel I really need to get this bit toned up. I try to do planks most days and I do one I read about on MN involving breathing in, relax, draw tummy in and up, breath out whilst pulling in more.
I cannot commit to a dvd exercise regime.
A hula hoop does not fit in either my house or garden 
No to gyms.
Ditto to classes.
I'm 52
Any alternatives?