America's kids are on summer vacation, but First Lady Michelle Obama is urging them to work hard -- and work out -- to fight the nation's obesity epidemic, as part of her "Let's Move!" initiative. New York City -- where one in ever five kindergartners is obese -- now sponsors a summer camp specifically designed to fight obesity. Participants focus on fitness, nutrition and mental well-being, learning to reverse bad behavior and avoid a lifetime of health woes.Duration: 01:50