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A striking vertical phone wallpaper of a muscular adult man standing shirtless in an indoor gym, torso angled slightly right with arms relaxed at his sides. He wears dark grey athletic shorts with a drawstring waistband; bare chest and abdomen are set against clean negative space under soft ambient fill lighting from overhead fluorescent strips. The composition is screen-safe on the center-left., wearing underwear or swim trunks, covered genitals, no frontal nudity, a single uninterrupted photograph only, no written words or typography anywhere in frame, no captions, no app UI, no social-media post layout, no screenshot borders