Girl stares at me, but doesn't say anything?

There's this one girl that I run into at my gym sometimes . All we say is hi . every time she sees me she smiles. The other day she was working out in the machine next to me and she was staring at me , but did'nt open her mouth . I looked at her and had to say something just because it was so weird . So I said "You know , you're like the laziest person here , you're so relaxed when you work out " . Once she heard this , she smiled , gave a bit of a chuckle and continued her workout .

So what's going on here ? I don't think she's shy because I have seen her speaking to one or two other guys at the gym .

Girl stares at me, but doesn't say anything?
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