Doing a million reps does not necessarily mean you are doing them correctly.
A proper crunch should be done as follows;
o Put your heels up on a bench such that the legs are bent 90 degrees.
[This removes the hip flexors from the equation as much as possible.]
o Pretend a string is attached to your
belly button. Pull the string to the ground and hold that position.
o With your hands behind your head - DO NOT pull up with your hands - this is just a resting place for them.
o Now move upward so that the
shoulder blades are lifted from the floor.
If you are performing these correctly - you will start to feel the burn between 8-12 reps.
Variation is moving right elbow to left knee and the oppostite.
You only need to perform maybe three sets of 12, 3X per week.
Doing a million reps just adds endurance not necessarily definition. Adding weights to your hands adds strength and some definition