I'm not sure about them but I have heard that ellipticals with short strides can aggravate knees. I imagine any compact 'elliptical' would have a short stride and thus might be an issue.
I have heard other people say rebounders have worked well for them. Although they aren't exactly small, they can be put away fairly easily.
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My healthy eating motto:
Eat for the body you want, not for the body you have.
My exercise motto:
Exercise for the body you want, not for the body you have.
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