How often for cardio?

[ricsan]

Also, for me personally, I don't count warm-up time. I start the time after I begin to sweat. You don't start burning fat until that point anyway.

i think it has more to do w/ your heart rate....in relation to your age & weight/height.....and burning calories...muscle building helps burn calories....

i like reading this mag its great IMO....http://www.menshealth.com/cda/homepage.do?source=rodale