** FILE ** First lady Michelle Obama runs onto the field as she arrives for physical activity with kids at the ESPN Wide World of Sports Complex at the Walt Disney World Resort in Orlando, Fla., on Saturday, Feb. 11, 2012 during her three-day national tour celebrating the second anniversary of the "Let's Move" program fighting childhood obesity. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

** FILE ** First lady Michelle Obama runs onto the field as she arrives for physical activity with kids at the ESPN Wide World of Sports Complex at the Walt Disney World Resort in Orlando, Fla., on Saturday, Feb. 11, 2012 during her three-day national tour celebrating the second anniversary of the "Let's Move" program fighting childhood obesity. (AP Photo/Carolyn Kaster)