1boy, middle-aged, mature male, short dark brown hair, gray streaks, fitted zip-collar performance shirt, natural chest contour, lightweight track jacket tied at waist, straight tapered training pants, looking at smartphone, stretching guide, cautious arm stretch, focused expression, gym setting, natural lighting, volumetric_light, dynamic_lighting, dynamic_shading, dynamic_angle, perfect_illumination, cinematic_wallpaper, intricate_background_details, 4k_wallpaper, aesthetic_wallpaper, sharp_focus, perfect_shading, aesthetic_background
Mozu's Bell
