Losing belly fat and getting a flat stomach, maybe even six-pack abs for the most ambitious, is like the holy grail of fitness. It might make you feel better to know that certified personal trainer and fat-loss coach Oualid Zaim says, "Even people who seem to be able to lose weight often end up struggling in the face of their stubborn belly fat." So if you're working hard to get a flat belly, and it's not working, you're not alone. It may be as simple as focusing on these four things.