text: what is the best exercise for abs?   crunches. feet in the air, knees bent @ a ninety degree.  bicyle crunches are done just like regular crunches except when you go up bring your right elbow to you left knee, go down then bring your left elbow to you right knee.  reach throughs done simular to the crunches. keep you feet on the floor. when you go up bring you hand and arms through your legs while siting up make sure you go all the way to the floor when you go back.  these three will strengthen your abs.