If she can teach back to back aerobics classes her CV system at least must be in good shape, and that's the main thing I ever got out of those things anyhow, not weight loss.
I'd take classes from her, although I have to admit, I might be a little worried she'd stroke out on me the first time through. 240 pounds is pretty big, unless she's really tall.
If they were evil *and* clever, they would have fired her for health reasons, not appearance reasons. Anyone who fires anyone for appearance reasons is just asking for trouble.
Wyst