Making yourself appear bigger/stronger?

Do guys make themselves look bigger or stand in a position to show their muscles in an attempt to show interest? A guy I was talking to always faces his chest towards me, even if he's talking to someone else his shoulder will be slightly turned in my direction and yesterday he had his arm extended leaning on something above both of us and his body facing me on a diagonal, just wondering if other guys do this and do you think subconsciously or consciously?
Making yourself appear bigger/stronger?
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