Atlanta Hawks center Al Horford says he's definitely out for the first round playoff series in the NBA against the Boston Celtics. The Grand Ledge High School graduate missed most of the season recovering from surgery to repair a torn left pectoral muscle. Horford practiced earlier in the week but conceded his left arm just isn't strong enough to endure the wear and tear of a grueling playoff series. Hoorford is still hoping to play in the second round if the Hawks advance.
