High school senior Gabriel Lewis has rewritten his school’s record books—and he’s done it without the arm swing that powers most runners’ kicks. Born without his left arm, Lewis was drawn to running in middle school “because it’s just so much harder than any other sport, and it’s on you if you want it,” he says. After years of injuries from compensating for the extra weight on his right side, Lewis had a breakthrough his junior year with the help of dedicated strength training. Since then, he’s broken school records in the 1600 meters (4:26.37), 3200 meters (9:54.63), and 5,000 meters (16:12) for Mount Dora High School in Florida. He recently placed 10th in the 1600 meters at the Florida state championships. The first record to fall came as a bit of a surprise to Lewis’s coach, Cody Adkinson. “I had him entered in an early morning two-mile race, and the goal was to get close to the record, but not to break it yet, because he hadn’t been that close yet,” says Adkinson.…