There are two contrary opinions among the people, about abs crunches. One group of people says that it works in developing a killer six-pack, while other group says that it does not work. The genuine answer to it is that it depends upon many factors such as genetics, stress, slow metabolism, and improper digestion, eating late night, poor posture. If you do not give optimum attention towards these factors and try to exercise your abs for a killer six-pack, you will hardly get any noticeable results. If you have a habit to eat late night, it will result in growth of fat over your abdomen. Still if you try to shape your abdomen by doing abs crunches, then how can you expect to get desired results? 

Here are some types of abs crunches, if done regularly along with proper diet, will surely help you in developing a killer six pack. 

The Basic Crunch: 

The basic crunch is helpful for upper area of the abdomen and abs. The procedure to do the basic abs crunch is as under. 

1. First of all lye down on you back. 

2. Bend your knees and place your feet on the floor such that toes come near to your hips. This provides support to lower back. Now place your right hand on your left shoulder and left hand on your right shoulder such that both the hands make cross over your chest. 

3. Now slowly try to rise up your upper half part of the body, simultaneously pressing your lower back against the floor. Exhale slowly, when you reach the peak of the crunch and when you start to inhale lower your back down slowly. 

4. Repeat the above step No. 3 for about 20 to 25 times and take rest for about 1 minute. Then perform the crunches for about 3 to 4 sets by taking rest of 1 minute after every set, this will be sufficient for the day. But remember not to try to do excessive abs crunches in want of quick results, because after doing first 25 to 30 repetitions you will feel lack of energy and most probably you will not perform the crunches correctly. 

Initially after doing 20 to 25 controlled and perfect movements you will feel you abs muscles working. If this is not the case then surely you are not performing the movements as ideally required. Your movements should be focused on your middle section, alternatively if your neck feels worked, then you should note that you are not performing the abs crunches properly. 

The Reverse Crunch: 

Lower portion of abdominal is worked by this exercise. 

1. Firstly lie down on your back, place your hand straight along your body, touching the floor and palms facing towards floor. 

2. Keep your back and head straight and slowly raise your legs up in the air, slightly bend your knees and cross your legs. 

3. Now try to raise your hips off the floor for about 2 inches and try to keep this position without falling down. Stay in this position for 3-4 seconds and perform abs crunches, while keeping your hands, back and neck on the floor.