Is this a good exercise?!

Question: Is this a good exercise!?

I found this video on YouTube for ab workout!. He's pretty much doing a crunch with his legs on the bench!. I was wondering if it an effective exercise!?
http://uk!.youtube!.com/watch!?v=Tbqat5BPDA!.!.!.Www@Answer-Health@Com

Answers:

crunches done like this are very good!. sit-ups are betterWww@Answer-Health@Com

that or a normal crunch
whichever burns moreWww@Answer-Health@Com

umm, sureWww@Answer-Health@Com

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Is this a good exercise?!

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