There are two things you would have to do.

The first is regular cardiovascular exercise such as walking, jogging, running, swimming or cycling. This is how you would lose weight and reduce your body fat percentage. This is the most important thing you can do, because no matter how much you try to develop a six-pack, it won't be visible (and therefore,not a six-pack), unless you reduce the fat around the abdominals.

The second thing, is to do strengthening and toning exercise and obviously to include exercises that make use of the muscle groups in your abdominal area. The exercises that you do will depend on whether you have access to a gym or you do body weight exercises at home. I would suggest you have a look at the 'Zone-in-on' section of the Health 24 website (www.health24.co.za). You can find this section under 'Fitness', and then just click on the image that shows the areas you want to work on, and you will be able to see the exercises relevant to you.

Good luck