Is this OK to say to a girl in the gym I find attractive? (she doesn't smile)

Seen this girl in the gym for about 4 times already. I noticed her glancing at me while she's running on a treadmill and while she's stretching... Show More

Updates:
Just want to make it clear. I caught her many times staring at me and then she just turn her head down. I just want to be friendly and introduce her to the regulars there. Because I think she doesn't know what do in the gym.

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