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An adult man runs up metal stairs, viewed from behind and slightly to the left. He wears a white sleeveless tank top with pinkish underlayer hem, black ribbed compression shorts above knee, neon green socks, and running shoes with red accents. His thick thighs and defined calves fill vertical frame against architectural background. Clean negative space surrounds him for screen-safe phone wallpaper composition., 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