What does it mean when a guy stretches in front of you?

Well, there's this guy who sits in front of me and he's stretching all the time! The class is 50 minutes long and he does this about 7 times or more, really. And every time he stretches, he turns his head and looks at me then turns his back and stretch his arms out really far back. He does it in every single class. I'm really curious... why does he do that?
What does it mean when a guy stretches in front of you?
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