Adult man seated on black rubber gym flooring, legs extended forward

Prompt

Adult man seated on black rubber gym flooring, legs extended forward with knees slightly bent; right hand pulling up the waistband of dark shorts or underwear near the crotch area while wearing a blue button-up shirt that is partially unbuttoned and sleeves rolled; Shirtless adult male torso visible but head out of frame center-right; Thick thighs, defined quadriceps and hamstrings exposed fully; White crew socks on both feet; Indoor gym setting with brown leather bench edge bottom-left; Soft directional lighting highlighting leg musculature; Vertical portrait 13:19 aspect ratio; High-contrast leg definition focus, shot on iPhone 15 Pro main camera, authentic smartphone computational photography, natural Smart HDR and true-to-life skin texture, vertical 9:16 Xiaohongshu lifestyle feed, bright clean everyday scene, unretouched phone photo with subtle sensor grain, trendy Chinese internet 网红 aesthetic, candid influencer energy; single clean uninterrupted photograph with a cohesive editorial composition and plain continuous surrounding surfaces