Girls, How can I tell my girlfriend to improve her work out?

RedLook
We have been living together for a while, and she got heavier lately, my workout is very intensive, but she is the kind of people that doesn't have that "passion"'. She wants to get fit and I know she doesn't feel comfortable with her body. Every time I make a comment about it she tells that I don't like her so the only safe way for me is telling that is okay and that latter she can improve. I am not with her because her body but I would LOVE to see her in a good shape.
Girls, How can I tell my girlfriend to improve her work out?
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