The Kill Up is ann intense version of the sit up. Do not attempt this exercise if you are not already training abs. This exercise should only be done by those with experience in working their abs. The Kill Up works the entire abdominal area, however, is highly concentrated on the upper rectus abdominus.
How to do:
1.Lay on your back with your feet braced against or under a stationary object. Do not lock your hands behind your
head.
2. Begin a normal sit up movement.
3. When you reach your most intense contracted position
you must put all your attention into the abdominal area
tensing it as hard as possible for a count of 3.
4. Keeping your abs as tense as possible slowly return to
a prone position. It should take you at least 6 seconds to
reach the floor.
5. When you reach the floor, keep maximum tension on the
abs and repeat the motion.
6. Continue repetitions to failure.
7. After failure, rest 90 seconds and do a set of conventional sit up to
failure.