Girls, Is the gym girl instructor into me?

I work out at a gym where they have this hot girl instructor (great body but not so pretty). She never spoke to me until a few days ago. In fact, she was the one who started the conversation (she made a funny comment about me being tired after a workout). Before I noticed that she looked at me from time to time. Does that mean she's into me? Or is she just trying to be nice because she works at the gym?
by the way: I'm tall and muscular
Girls, Is the gym girl instructor into me?
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