Blue Cross Blue Shield of Arizona is teaming up with elementary schools throughout the state for the 10th year of the Walk On! Challenge, a fun, educational program designed to motivate kids across Arizona to incorporate healthy habits into their daily routines. It’s all part of an effort to promote exercise and good nutrition as key elements of a healthy lifestyle. Using the formula 5-2-1-0, program materials will teach children the following four principles: eat five fruits and vegetables every day; limit screen time (TV, video games, computers) to two hours or less per day; get at least one hour of physical activity each day; and avoid sweetened drinks, filling up on water instead. Fourth and fifth-graders will be challenged to track not only their daily minutes of exercise, but how many fruits and vegetables they eat, how much screen time they get and how many sweetened drinks they have each day in the month of February.