Abdominal "V" Crunch Exercise for Six Pack Abs: Lie on your back over the mattress. Fold and rest the hand over the front of the chest. Flex upper body and lower leg together. Hold the knee with hand and immediately let it go. Straighten the upper body and lower leg while using abdominal muscles. Repeat the exercise 10 times. Reverse Crunch Exercise for Six Pack Abs: Lie on your back. Hold the arm behind the head while legs laid flat on the ground. Bend the lower leg at knee and hip. Bring the k