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Originally Posted by gospastic
i've started doing light warmups before my workouts, like 10 minutes on the stairs or bike or treadmill. i've found it helps my weightlifting in that i feel a little more energetic throughout. i don't think i would ever do full blown cardio, like 30 minutes, before a workout though. it just doesn't make sense. you'd burn most of the glycogen stored in your muscles i would imagine, leaving nothing for weight training. now that i think about it running after a workout doesn't make sense either. not that i've given it that much thought at this particular moment.
either way, i would say do cardio on your non weight training days.
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doing a 5-10 minute warm up is just common sense, you do it to get the blood flowing to your muscles and actually warm their temperature to lesson the chance of injury.
but i'm curious as to why you say you don't see the point to doing cardio after lifting? i know both arguments for and against doing it beforehand (and i think whether or not you do it then should mainly be based on your goals and the specifics of that days session).