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you want to make sure your crunches are effective so the amount is not necessarily as important as the way crunches are done. I just read you have to vary you ab routine also. 20 minutes seems to be the accepted minimum for exercise in a day. anytime you lower your calorie intake from your normal diet you should see weight loss.

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Q: Do 450 crunches and 20 minutes aerobics and 600 calories diet a day flatten stomach?
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Related questions

How many calories do you burn after 100 crunches?

I have no idea what the previous person was talking about.Anyway, 100 crunches burns about 50 calories.


How many minutes does it take to loose 300 calories?

Depends on how hard you push. Going flat out, I'd go through 300 cals in 20 minutes, but I'm used to it. At a more regular level you might expect to use up 300 cal by doing 40 minutes of aerobics.


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The Crunch test assesses how many crunches you can do in 10 minutes. true or false?

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