Rope Cable Crunch 2

1) With a mat underneath you, begin with your butt on top of your ankles, and your hands grasping a rope attached to a cable behind your head.

2) With only your abs, pull the rope in a downward motion until you cannot go any further with your butt remaining on your ankles.

3) Slowly return to the start position.

Notes: This motion should require a small arch of your back, the exercise should involve only your abs.  Try reconsidering your weight if you cannot complete the exercise without the aid of momentum.