Sydney Sweeney is one of this generation's biggest stars. Her new film “Christy” tells the story of the trailblazing boxer Christy Martin, who broke into the male dominated world of 1990s prizefighting and became one of the biggest stars in boxing. It may not seem like Sydney — star of the hit teen show “Euphoria” and rom-com “Anyone But You” — would have much in common with Christy. But they both come from small towns, broke into their respective industries without connections, and have backgrounds in combat arts. Sydney joins Tom Power to talk about taking on the role of Christy, the physical transformation she underwent, and how her own background in martial arts influences her life and career.