Cranks - An Advanced Abdominal Movement

Cranks are a very challenging abdominal movement that I use with my more advanced athletes.  Performed correctly, this movement will build incredible strength throughout the entire core; as can be seen in the photo to the left.

A video demonstration of cranks is available here.  The video is clearest when reduced in size.

In addition, an article detailing crank performance guidelines is available in my basic strength forum under the title; "A Brutal Abdominal Exercise".