The countless joys of parenthood are often accompanied by unwelcome weight gain. It doesn’t have to be this way. Mark Macdonald, a New York Times bestselling author, nutritionist, fitness guru, and father of two, has developed an exercise plan specifically for busy parents. In his latest book, Why Kids Make You Fat, Macdonald shares his proven eight-week program to help moms and dads everywhere reclaim their health and vitality for good. Read an excerpt.