I don't have full confidence in my body, the 28-year-old says, two weeks out from an unprecedented challenge in her esteemed career. But that's OK, because I have learned that there are a hundred ways to get the same outcome, and we're just going a different route to normal. Much has changed for the hyper-competitive Kennedy since the Paris Games 13 months ago. Physically, her left hamstring has been surgically repaired.