best exercise for upper abs

hi, what is the best exercise for upper abs?  thanks

Get an exercise ball.  Not the smallest, not the largest.  Mine is green (sorry I can't remember the circumference) sit on it.  With your feet, moving forward and your back going backward, roll down until the ball is in the small of your back http://www.shapefit.com/abs-exercises-exercise-ball-crunches .html I started these when I was 330 or so.  Did 3 sets of 15 reps.  I am now up to 4 sets of 50 reps.  It's really not that hard and I feel it every time that I do it. I also do side crunches to target the obliques for one of the sets.