I have heard so, in order to build muscle or maintain, it is optimal to do cardio actually at a later or early time than weights because it taxes your energy or something to build muscle. Oh let me find the article...
Personally I believe cardio to be the best and most effective when it is done first thing in the morning on an empty stomach. Your body has not had any type of carbohydrate fuel for many hours, since you were sleeping, so you will burn bodyfat more efficiently as fuel.
I would not advise doing cardio before a workout, unless it is a brief 5-10 minute low intensity cardio to warm up. It is important to remember that your goal here is to build muscle and you want your body to be in an optimal state for your workouts. Weight training after cardio is not an optimal state, because the cardio will deplete your body of glycogen leaving you with less energy to lift weights. You need to save your energy for the important task at hand, which is to lift hard and heavy. Cardio after your workout is better, as you may be able to burn some extra bodyfat, especially after a leg workout. By doing the weights first, you deplete your body of glycogen.
Once depleted, your body can burn fat efficiently. However there is one drawback to doing cardio after a workout is that cortisol levels may become too high and put you in a catabolic state, which can break down muscle tissue and hinder growth. Personally I believe the best bet is to split up your training so that there is ample time between cardio and weight training to recover.
I don't know, or were you being sacastic??? Anyone I have ever talked to has told me to do my cardio after. I used to do it before and found this article to be true.
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