Kristi Thompson looks forward to waking up for her 6 a.m. Hustle class each morning in Cary, NC. If you told her seven months ago that she would have the energy and the drive to wake up at the crack of dawn every single weekday, workout for an hour, get her three-year-old daughter off to day care and herself ready for work by 8:30 a.m., she would have laughed at you. Why? Because seven months ago, …