The Indianapolis Colts finally found something Andrew Luck can't do: sing. Now they're hoping the No. 1 overall draft pick will be in tune when he starts throwing Sunday afternoon. Less than 24 hours after serenading teammates with "Country Roads" during a rookie initiation, Luck trotted onto the practice field for his first NFL training camp workout -- a light walkthrough that served as little more than a warm-up act for Peyton Manning's hand-picked successor. "It's always good to get out there with the offensive line, with the receivers, and it will be good to have a full-speed practice coming up this afternoon," Luck said after the morning session. Read more: http://espn.go.com/nfl/trainingcamp...-impresses-indianapolis-colts-command-offense
