I've burned through a bit over 50 lbs in fat lately. Cardio is something that you can get burned out on fairly quickly. I tend to do it 6 days a week, but I hear anywhere from 4-6 is good. Take a day off every now and then. The key is to do a good 25 to 30 minutes of reasonably high heart rate stuff. To burn fat it doesn't have to be as high, but if you are running you might as well get the cardio benefit from it as well. It is very easy to overtrain. Yesterday, my wife ran 5 miles in the morning, did 30 minutes of ab work, took a step aerobics class with me for 30 minutes, did another 30 minutes of core training in the same class and then lifted weights for 30 minutes. She ate light and gained a pound. She was all ticked off and tired as well. I did my 30 minutes of cardio, 30 minutes of core training and 30 minutes of light weights, and I dropped in weight a bit.
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