You need to be blunt. Tell her everything you've been feeling- communicate. Maybe use some euphamisms, but tell her that you want to be healthy, and so should she. Tell her to stop whining if she's not going to do something about it. If she is overweight, she is endangering her health, and you can stress that point. Ask her to come to the gym. In fact, don't just ask- MAKE her. Also, help her get back into better eating habits by keeping only tasty (fruit, veggies...etc) health food on hand for awhile.
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