I'm not sure about this cause fat loss has never been my interest. I remember reading some stuff about this: cardio in the form of long duration steady state aerobics gives you the least bang for your buck. The time you spend doing aerobics can be better utilized in lifting weights.
If you calculate the number of calories you burn during aerobics versus weight training - then aerobics wins hands down. But thats that for you. Aerobics wont do anything after the session is over.
Lifting weights on the other hand will boost your metabolism cause of which you keep burning more calories even after the session is done.
It will not strengthen you. Lifting weights will build muscle.
Of course it doesn't have to weights. I just used it as an example here. If you really want to do 'cardio' try high intensity interval training. The basic concept is something like this: for fixed durations say...10 or 20 seconds you alternate a full blown exercise which requires lots of exertion with something low in intensity. For e.g.: sprinting full speed alternated with just slow walking.
If this appeals to you then just google Tabata Protocal.
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