If maintaining good health and fitness isn't reward enough for staying active, sometimes a financial incentive can be even more powerful. Sure, exercising regularly may save money on health-care costs in the long run, but more immediate returns can be had, as well, if you know where to find them. Some methods require a fitness tracker from a brand such as Fitbit, Jawbone, or Misfit. Others are open to anyone with a smartphone. Either way, you don't have to be a personal trainer or fitness instructor to get paid to work out.