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Indiana Pacers center Roy Hibbert has been putting in work this offseason, working to improve his physical fitness and his game for the forthcoming 2013-14 NBA season. His workouts have been well documented. [Tweet of the Day: Tim Duncan Putting Roy Hibbert Through the Ringer] [SH Blog: Roy Hibbert Teams With Duncan For Offseason Workouts…] A few weeks ago, Hibbert posted a video to his Vine account, bragging that he had bested his tire workout. Tire giant Goodyear heard the message loud and clear. They