Girl's Behavior

What does it mean when a girl looks at me when I'm not looking and turns away when I look back? This has been going on since a while in my gym?

This girl is from my gym. I'd say I'm pretty confident looking. I have a friendly attitude with many people in the gym. I recently noticed that this girl is looking at me when I'm in visual range. She usually looks away when I catch her looking at me, but there are some moments when our eyes lock for 1-2 secs. And when I am in close proximity, she never looks at me face to face. As far as I know, I don't think she looks at anybody else like that. I kinda like her too. What does it mean? What should I do? (I'm not really that experienced in talking to girls). Advice please.
What does it mean when a girl looks at me when I'm not looking and turns away when I look back? This has been going on since a while in my gym?
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