Paralympics standout Raymond Martin working hard to hold off whoever emerges as the next Raymond Martin

Raymond Martin was a breakout star at the London Paralympics of 2012, winning four gold medals in wheelchair racing as an 18-year-old. Now working toward the 2016 Games, Martin knows he'll have to be better because new, stronger and faster Paralympians continue to enter competition. My story for TeamUSA.org: http://www.teamusa.org/US-Paralympics/Features/2014/June/16/Raymond-Martin-weary-of-next-Raymond-Martin