Eleven years ago, in the midst of a down economy, 46-year-old Ned Johnson made a bold move: He quit his job of 19 years to chase a dream. Johnson bought a small stand-up paddleboard business, because he loved the water and believed that the sport’s many health benefits represented a major business opportunity. That was especially true in his home state of Florida, which is surrounded by ocean and has countless rivers and lakes. Today, Johnson is 57 and has more than 30,000 customers that include