Does it mean anything when a guy stretches so his chest is puffed out?

Example: puts his hands behind his head then stretches back into kind of an arch. I know that when a guy puffs his chest out it is a flirty body language signal but I was wondering about the stretching because I've had guys do this around me. Or is it just a stretch? I don't know if I'm reading into it to much or not haha
Does it mean anything when a guy stretches so his chest is puffed out?
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