How do you tell a girl to work her flat butt?

Anonymous
My girlfriend has a flat butt, and I'm trying to get her to squat more. She cries and shuts me off whenever I try and encourage her to do it. I told her that I like it how it is, but it can definitely become curvier and exercise is good, and that I'm just giving constructive feedback.. not trying to put her down.
What's the best way to tell a girl to work her butt?
How do you tell a girl to work her flat butt?
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