Shell, I really hope you do get back to the gym - I know that's one of the things that helps me the most. I do a half-hour of cardio and 10-15 minutes of weights every work day at lunchtime and do a lot of walking / household chores on weekends. Keeping me moving (which I believe Heather's book recommends anyway)keeps everything moving!
Don't forget that exercise doesn't have to be "go to the gym", either - lots of things, like gardening, housework, even grocery shopping can be an effective workout (especially at peak periods!) But I think that walking is probably the best because you literally set your own pace.
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Re: Exercise
But I think that walking is probably the best because you literally set your own pace. 
