Sydney Sweeney went through three and a half months of training, which resulted in her gaining over 30 pounds for the role. Sydney Sweeney sat down with The Hollywood Reporter 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 Vi