Hi, I'm Denise Druce for LIVESTRONG.com. Let's look at how to exercise for a flat stomach. I'll show you three variations of the standard plank. This is a traditional plank. It's just like a push-up. The top of a push-up. Spread your fingers wide and your hands are light underneath your shoulders. You might even open up your shoulder blades a little bit. Hollow out your belly, tuck your tailbone. And come way up onto the tips of your toes. If that's too challenging you can drop one knee. And then the other and work up to coming to your toes. This is an elbow plank. So come down to your elbows and forearms. You can start this on your knees. But if you want it to be a little bit more challenging tuck your toes under and come up. You want to make sure to pull your abdominals in tight. And you might even want to tuck your hips under a little bit to keep your back and your core nice and strong. To make this more challenging even still you can tuck your knees to the floor. This is a side plank. Come down to your elbow, make a fist. And make sure your elbow is right underneath your shoulder. So the easier version of this is lifting your hip off the floor and using these obliques. You can extend one leg out to the side to make it harder. Or if you'd like more challenge come up to your feet. And make sure that your hips don't sag down. Keep trying to lift your hips up and engage the obliques. These are some methods for how you can get a flat stomach. I'm Denise Druce for LIVESTRONG.com.