Do all guys normally flex their muscles when they are bored?

Breathdeep
So I sit next to this guy in class and we talk. I find him completely adorable and we always crack jokes together and what not. I kinda like him but don't really know him much. But ANYWAY the past 2 classes I've noticed that he keeps flexing his arms muscles. Its subtle but I still notice. Is he stretching? Is he showing off? Or do all guys just randomly do this type of thing. Just curious!
Updates
+1 y
By the way, just so this is clear...Its not really a "stretch" its more of a "wow, look how big my muscles are!" type of thing! lol
Do all guys normally flex their muscles when they are bored?
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