Composite image: take the group of four men (actors Mark Ruffalo, Chris Hemsworth, Robert Downey Jr., and Chris Evans in gym workout clothes) from the first image and place them seamlessly into the gym interior shown in the second image. The background should be replaced completely with the modern black aesthetic crossfit gym from the second image featuring black squat racks, barbell weight plates, lifting platform, overhead square LED lights, and green turf flooring. Maintain realistic shadows, consistent gym lighting, and precise proportions so they naturally fit standing and sitting inside this new gym setting.
