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>>32169
don't bother with gyms; just work on improving her diet and activity level.
More variety and healthier choices, use supplement (protein shakes, etc.) to help control calories / satiety, daily 1+ hr walks at local parks or etc.
once she can nail the basics, you can introduce her to group exercises and strength training, etc.
finally, accept that she might monkey branching to someone else; women with low self-esteem tend to whore out the second they realize their potential. You accepted the risk when you entered this relationship.