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What is in the image: a diagram showing the musculature of a man's upper body, focusing on the armpit area. it's labeled with japanese and english text explaining the muscles involved and how they interact when the arm is raised.

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WDTagged Tags: muscular, how to, male focus, muscular male, pectorals, bara, 1boy, abs, large pectorals, armpits, faceless, cropped torso, nipples, navel, nude, multiple views, stomach, sketch, upper body, arms up, english text, faceless male, white background, multiple boys