40-year-old Alex Rodriguez will once again be on a baseball diamond in Yankees gear starting Tuesday, as he begins his next life chapter as one of the organization's guest instructors this spring in Tampa, Fl. Although Rodriguez will have the opportunity to express his own thoughts in a scheduled press conference, the Yankees skipper has already outlined A-Rod's duties. "He's going to work out with players (and) extend the knowledge that he has about how to play in the game to the young kids,"