The Kill Crunch is an 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 Crunch works the entire abdominal area, however, is highly concentrated on the upper rectus abdominus.
How to do:
1. Assume a normal crunch position. Do not lock your hands behind your head.
2. Begin a normal crunch 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 3 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
crunches to failure.