text: In my opinion, its more than just sit ups. You have to work all the muscles in your abdominal region. Getting a six pack is almost impossible in one month, because as you work muscles, you need to allow them time to "heal". But to start working towards the goal of a six pack, you may want to do 3 or 4 sets of 20 sit ups (remember to breathe) and then gradually progress to using a weight (like a barbell or other type of weight that you can cross across your chest). This will force your body to do more than just lift your body weight. Joining a gym that has a machine to work out your obliques and several machines to work your abs would be helpful as well. Best of luck!