1. Natalie Portman Learned Ballet for Black Swan

To portray a professional ballerina in Black Swan, Natalie Portman dedicated over a year to rigorous ballet training. She practiced six hours a day, pushing her body to the limits to capture the grace and precision required of a dancer at the highest level.
This intense preparation allowed her to convincingly embody the emotional and physical strain of her character, earning her widespread praise and an Academy Award. Her transformation showed the power of discipline and passion in acting.