This really works - lie flat on your back on the floor, raise both legs (at the same time) about 6-7 inches off the floor, hold them there for a few seconds and then lower them, then repeat. Do this several times and gradually increase the number of lifts you do at one time. Do this small thing ever day and in time your tum will flatten - it worked for me. Though I would also incorporate other exercises as well, the most important thing is that you do the exercises daily a few minutes a day is all that's needed.