The best yoga exercise for flattening the abdominal muscles is a cleansing practice that also helps with digestion. Pull the belly in and up when doing yoga withhelp from a yoga instructor in this free video on yoga exercises for the stomach. Expert: Cindy Mastry Contact: www.yogaetcstudio.com Bio: Cindy Mastry has practiced yoga since the age of eight, and also has a background in jazz and ballet. Active in the fitness industry for nearly 20 years, she teaches aerobics, kickboxing and yoga at many fitness centers in the Tampa Bay area. Mastry trained with the 84-year-old master yogi monk, Baba Hari Dass, at the Mt. Madonna Center in California, and owns and operates Yoga Etc Studio in St. Petersburg, Fla.