Scarlett Johansson, who plays Black Widow in the MCU, has revealed that her biggest challenge during filming Iron Man 2 was preparing for serious stunt work. At the time, she was in her early 20s and had never been to a gym. She had to quickly learn how to perform the complex choreographed sequences and make a massive lifestyle change. However, with the help of her trainer Bobby Strom, she was able to successfully train for the role and now considers fitness a huge part of her mental wellness.
