How many Sit Ups?

I found an interesting article,
"Best and Worst Abdominal Exercises".
http://sportsmedicine.about.com/cs/conditioning/a/aa020402a.htm

#1. Is "The Bicycle maneuver"
bicyclecrunch.jpg


I've done these before, but not a lot of them. I know they're part of the Pilates routine my wife does. I need to make them a part of my routine.
 
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