Generally the reason you DON'T want to do cardio before lifting is simply because when you lift, you should give it your all.
If you run a few miles before, by the time you hit the weights, you're not AS energized as opposed to lifting first. As mentioned above, lifting is anaerobic. It'd be wise to have as much energy in your muscles/body as possible when doing it.. otherwise, you're not really giving it 100%.
Personally, I ALWAYS lift before cardio and usually follow up with 10-15 minutes of HIIT cardio (walk 2 minutes at 60% heart rate, then run 1 minute at 90%.. repeat 4-5x). I usually do cardio on days I don't lift.
It is encouraged that you do warm up cardio before lifting. Not much, but just enough to get the blood pumping. I don't normally do this as I've tried with/without it in the past and noticed no difference whatsoever.
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