Image Credit: Getty Images Sydney Sweeney is stepping into the boxing ring-or more accurately, punching it-for what might be her most physically and emotionally demanding role yet. In Christy, the new biopic premiering at TIFF, the Emmy-nominated actress portrays legendary boxer Christy Martin. Sweeney, 27, committed fully to the role, even literally delivering real punches alongside her co-stars. "Every single fight you see, we are actually punching each other. We are going full force," she told Vanity Fair-and yes, she emerged with bruises and concussions to prove it.