Story & Reporting by Diane Roberts SANDY SPRING, Md. (WUSA 9) -- The United States has a growing number of overweight children. Statistics from the CDC show childhood obesity has tripled since 1980. Chris Grier, new head football coach at Sherwood High School in Montgomery County, wants to use his own story to help combat the problem. In March, Grier was named head coach at his Alma Mater....