With the 2012 Paralympics starting in London in roughly a month, adaptive athletes who compete in summer sports are putting the finishing touches on their trainings. And winter athletes, too, are hard at work, training just as intensely as their able-bodied counterparts, if a little bit differently. This spring in Bend, Oregon, FasterSkier chatted with Sean Halsted, a veteran member of the U.S. national team who finished seventh, ninth, and tenth in the sit-ski races...