Crunches on a sit-up bench?

Question:

what is the correct method for doing crunches on a sit-up bench, also what's the correct way of doing crunches on a mat?

thanks all, I ask because I feel like I've been doing them wrong...

Answers:
lay on back legs up and hands behind your back go as far as you can 10 at 1st

Other Answers:
only one way babe

Working out on a ball makes your muscles work harder.
http://www.hydroxycut.com/WOMEN/WORKOUT/EXERCISES/STOMACH/stomach_swissball_crunch.shtml
If you are on a mat, lifting you legs when you crunch works the bottom of your belly
while doing them with your legs to the side works the side

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Crunches on a sit-up bench?

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