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Rob Gronkowski walks to a stretching drill. The New England Patriots... News PhotoAmerican Football - Sport,Foxborough,Massachusetts,NFL,Sport,Sports Training Drill,Stretching,USA,Vertical,WalkingPhotographer Collection: Boston Globe 2013 - The Boston GlobeFOXBOROUGH, MA - SEPTEMBER 6: Rob Gronkowski walks to a stretching drill. The New England Patriots held practice on the practice fields at Gillette Stadium. (Photo by John Tlumacki/The Boston Globe via Getty Images)