Washington: Ahead of the release of \u2018Captain Marvel\u2019 this week, the film\u2019s star Brie Larson opened up about her superhero avatar and how she mastered the role.\r\n\r\nLarson appeared in the latest episode of \u2018Jimmy Kimmel Live!\u2019 and talked to the host about the amount of effort and training she put in for her character in the film, reported The Hollywood Reporter.\r\n"You're the captain now," Kimmel greeted her.\r\n\r\nAfter joking for a few minutes that Kimmel should wear the Captain Marvel costume, he asked her about when she first agreed to play the superhero role.\r\n\r\n"At least three years ago," Larson said. She also revealed that she wasn't allowed to tell anybody about the job for a year, "I was so scared," she joked, hinting at the fear of getting fired. \r\n\r\nThe host also asked the actor what it was like filming with Samuel L. Jackson, to which Larson responded saying they have become actual friends while doing three movies together and travelling the world.\r\n"There's things that only we know," she said of their bond. \r\n\r\nSpeaking about Larson\u2019s role of an air force pilot in the film, Kimmel pointed to some real air force pilots in the audience who were on the film as consultants.\r\n\r\n"There's a lot of sense of humour in the air force," Larson said, talking about how the pilots would warn her about a "50\/50" chance of puking in the air during aerial action scenes. \r\n\r\nThe actor also revealed training for nine months to achieve the physicality required for the role. She also had to learn how to make a "cool face" for many scenes, especially big trailer moments.\r\n\r\nShe explained how it was hard because she would sometimes start laughing and the stunt team had to dive in with suggestions for body movements like the "clenching" of her fist and jaw while turning around slowly.\r\n\r\nLarson demonstrated the \u201ccool face\u201d for the audience, encouraging Kimmel to give it a go as well. \r\n\r\n\u2018Captain Marvel\u2019 is set to hit the big screens on March 8. Co-directed by Anna Boden and Ryan Fleck, the film also features Gemma Chan, Ben Mendelsohn, Jude Law, Annette Bening and Djimon Hounsou.