@hollywoodreporter: Sydney Sweeney went through three and a half months of training, which resulted in her gaining over 30 pounds for the role. Sweeney sat down with The Hollywood Reporter’s to detail the grueling process she undertook to transform her body to play professional boxer Christy Martin. In #Christy, Sweeney, donning short black hair and a muscular physique that she built through diet, exercise and boxing training over a period of months, looks nothing like herself as Martin, née Salters, a West Virginian who stumbled into a boxing career in the 1980s and dominated her sport as no woman had before — all while remaining a closeted lesbian and suffering increasingly terrible abuse at the hands of her considerably older coach/husband Jim.