ALTON - The Alton Community Unit School District #11 values the health of its student-athletes, and athletic trainers like Andy Renner work hard to keep them in shape. Most people assume athletic trainers “handle all the injuries, but there’s more than that,” Renner said. His main interest is in preventing injuries in the first place. He wants to make sure his athletes are in a good place every time they step on the field, and he enjoys working …