Jeanenne had open-heart surgery to repair a mitral valve that wouldn't close. For the second time in a week, her life had been saved. But the trauma left severe psychological scars. The recovery was slow and fraught with complications—like a grapefruit-sized blood clot that required more surgery and caused extreme pain—so she stopped all exercise. She started eating more and gained 40 pounds, making her the heaviest she's ever been, at 187 pounds.