Not sure why this girl from gym likes me and not sure what to do either?

she sort of appeared earlier this year , at my gym , never seen her anywhere else but we must live in the same area as my city fairly small and pretty much everyone at gym is from this area.

but i don't know her name but she is often near me and always notices me, we haven't talked yet , she did know this one girl that goes there that i also know but i haven't asked her about her , sometimes she goes by herself and other times is with a girlfriend

Updates
4 mo
also note open minded as to a possible outcome with her , like if she just wanted to be friends that be ok but if she wanted to sleep together that be ok , feel rather open to various possibilities at this point with her
Not sure why this girl from gym likes me and not sure what to do either?
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