Many people go about spot fat removal wrong. First of all, there is no such thing as spot fat removal. It's impossible to get rid of fat in just one area, so if you want to make your abs flat and toned but there's too much flab covering it at the moment, you need to do lots of cardio to burn off the fat and strength training so that once your fat slides off your muscles are visible.
Of course, fat will slide off your entire body instead just at your abs. Check out this video for a 3 minute quickie ab workout that's intense and effective.
This 3-minute ab workout will make your abs strong, losing weight with good nutrition and cardio will make your abs visible by removing the fat covering them.
This workout is for those wanting flat, tight abs like a marathon runner.