Biggie,
Forget the twists. Try a classic exercise with a new "twist"--remember the old reverse ab curl where you lay down on the floor and you hold someone's ankles and they whip your feet down and you resist? Well, instead, bend your knees at 90 degrees (pull towards you) and bend your ankles at 90 degrees. Now, while laying on your back and yuor lowerbody flexed in these two positions, hold on to a fixed object (bar, someone's ankles) and curl yuor trunk up. Try to bring yuor knees as close to your face as possible. Its like you are folding yourself in half. This exercsie is excellent--and tough if done correctyly! It wil hit your external obliques hard! If you can't figure it out, check out the exercise on my website on the second video preview! Yes thats me performing them!!