Greta Waitz Battling Cancer

The 52-year-old Norwegian,a nine-time winner of the New York City Marathon, will watch Sunday's race from the lead car. She is undergoing chemotherapy and radiation for an undisclosed form of cancer. She's still running (7 miles on an 8% incline on the day of this report) on the treadmill.

""I think being an athlete gives you an advantage," she says. "The physical fitness gives you the mind-set that you cannot quit. All those qualities help you get over it."