In the provided image, edit the scene to remove the vertical vertical seam / mirror division line running down the right side of the photo through Chris Evans and Robert Downey Jr. (Tony Stark). Underneath Robert Downey Jr., who is in a squatting/seated posture in the red shirt, add a realistic black workout gym bench directly under him so he is naturally sitting on it. Seamlessly blend the background gym floor, equipment, and clothing where the vertical mirror line was removed, maintaining the exact same photographic lighting, realistic textures, colors, and appearance of all actors.
