Iron Man 3
In the Iron Man films, it’s Tony Stark’s brilliant mind and large sum of money that allow him to be a superhero in his spare time. Don’t let that fool you though—Robert Downey Jr. has made sure to pack on tons of muscle for each installment of the series. As he told us, he put on 25 pounds of muscle leading up to The Avengers through a rigorous training routine and a protein-rich 5,000-calorie diet. And don’t forget, health and fitness addict Gwyneth Paltrow is the love interest in these films as well.
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