How do I talk to a girl that I like for the first time if I don't know anything about her?

there is this girl that goes to the same gym that I do and she is like a year or two younger than me. I always look at her and she looks at me but when our eyes meet one of us looks another way. I would really like to go out with her but I just can't find a way to approach her. also I am a little shy and I think she is shy too.

Thanks.
How do I talk to a girl that I like for the first time if I don't know anything about her?
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