Monday afternoon, in the heart of Paris, Howie Sanborn will chase his gold-medal dream. He’ll race his wheelchair down the Champs-Élysées toward the Arc de Triomphe. He’ll swim the River Seine. “We’ve got a slogan: ‘Burn the ships,'” he said. “We’re all in. There’s no going back.” The origin of Sanborn’s quest began in the hospital bed of an intensive care unit during the darkest days of his life.