How do you get a girl to start squatting?

My mate is a gym addict and wants to get his gf into squatting. Without asking her to do so.

At the moment he's Facebook liking all those nice ass gym photos hoping that she takes a hint.
I suggested he likes about 20 different photos within a short period of time lol but I don't think he's going to do that.

The girl is a reasonable looking girl but im sure every guy would want a girl who squats.

What are some ways to get her into it? Without offending her. She does have a reasonable ass but it could be better.
How do you get a girl to start squatting?
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