Sponsored By Dr. Oz's 7-Day Belly Workout Say goodbye to shapewear! Dr. Oz's 7-day workout plan will help tone and tighten your tummy. The exercises change slightly each day to keep your muscles guessing, allowing them to change shape. For more belly-busting tips, click here. Posted on 9/07/2011 | Comments () Print Tighten your stomach in just 7 days with this fat-busting workout.