Assuming you weigh about 155 lbs you'd be burning about 200 calories per hour. If you're looking to speed up your metabolisam (by adding muscles) then you should incorprate crunches with other exercises like push-ups. If your just looking to burn calories from the food you've eaten then you should switch to cardio.
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Posted by HeatherSoiset
I was wondering how many calories you burn while doing crunches...I am trying to lose weight.