aerobic simply means with oxygen, and describes the energy system suppliying the bulk of the energy. the term cardio represents cardiovascular (the system consisting of the heart and lungs). if i remember Ex Phys class, terms are used more so to descibe the length of time you can sustain. cardio is lower intensity and the theorey is that it will done for a longer period of time (longer duration more kcals burned) remember that was in theorey and is alittle outdated terminology and is often misused. the term cario typicaly is related to more of a performance aspect...if your mile time drops your deemed more cardiovascularly fit. it comes full circle because how do get more cardio vascularly fit...by donig exercise at intensities that allows the body to oxidize fat into energy. i guess what i was trying to get at, was cardio would term usd to descibe the exercise and aerobic would be the system the body uses the supply the energy to perform the cardio. sorry i got a liitle excited and started rambling
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