The Thousand Pound Christmas by Victoria Burgess

ONE SMALL TOWN. ONE BIG CHALLENGE. GAME ON.
After her small town is mocked online, a rookie mayor accepts a challenge to help her community lose one thousand pounds by Christmas Day.
Meet Rachel Presley. Single mom and small-town mayor. She’s got a job she loves, friends she adores, and family that drives her only moderately crazy. Life is good—until a snarky website slaps the label ‘America’s Chubbiest Town’ on her beloved hometown. Shocking. Outrageous. And an instant viral and media sensation. Guess whose job it is to fix it? Rachel’s.
Enter fitness guru Jym Granger, who throws out a nearly irresistible challenge: if two hundred townspeople lose five pounds each by Christmas Day, he’ll pay the town $100,000. A chance for the town to earn some desperately needed cash and save face?
Game on.