Middle schools across the country participated in the Let’s Move! Flash Workout Tuesday, including League Academy in Greenville County.  The event is designed to underscore the importance of physical activity as part of a healthy lifestyle for children, Music superstar Beyoncé is the exclusive featured artist for the Flash Workout event. She has re-written and re-recorded one of her songs to give it a Let’s Move! message and has titled it "Move Your Body." All of this is being done in support of First…