If you are looking to improve your muscle and burn fat, then do weight training first. Focus on your muscle first, because weight training is pure carbohydrate burning. It is very hard to lift heavy on fat. Once your carbs are a little lower, you can move to aerobic training. Aerobics works best on a mix of fat and carbs. Lower your carbs, burn a little more fat. You still have enough energy to easily get your heart rate to a sustained aerobic and calorie burning level. If your do cardio first, you may sabotage your ability to push hard enough during your weight training workout.
If you want to specialize in cardiovascular conditoning, do that first. Just don't expect as much out of your strength training. But, if you are a mid to long distance runner and like that skinny, strung out look, then go run to your hearts content. You won't be able to grow much muscle.
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