Is it normal for a girl to look at me while im on the gym without me doing anything weird?

Okay so there's this girl who sometimes looks at me I've caught her a couple of times and one day she just stared without moving her eyes from me for straight 30 secs (or so i felt it) i knew she was looking at me so i stared back and there she was but then i kinda felt uncomfortable so i just kinda started to move my eyes in all the directions possible that were not anywhere near her

Is it normal for a girl to look at me while im on the gym without me doing anything weird?
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