Mary Cain says company's track and field program is physically and emotionally abusive
                                
                                
                                    (Newser) -
                                    "I was the fastest girl in America," Mary Cain recalls in a video op-ed for the  New York Times . But her message isn't one of fond recollection. Cain, now 23, delivers a devastating critique of Nike, whose training program she joined  as a teenager . Her dream at...