crunches

decline situps, hanging situps. add weight

 

leg raises, bicycle crunches.... Check them out on youtube.

 

V-ups. Elbows to knees.

 

ab wheel and the what the others say

 

Crunches with weights on your chest

 

Try some of these,


http://www.bodybuilding.com/fun/exercises.php?MainMuscle=Abdominals

 

you should continue to do the crunches for endurance, but mix in some rotational strength exercises and exercises with more weight, i.e. a medicine ball.

 

dont forget your obliques and your lower back.