That line of thought is so CW. Yes it can be a tool for that. The truth is though that what is constantly referred to as "cardio" is really not. It is aerobic exercise because it is carried out at a low enough intensity to be done for long duration. High intensity exercise such as brief, very intense weight training is far more taxing to the cardio vascular system, thus a far better workout for it. Sprint type intervals are far more taxing than any steady state training, thus much more productive. The heart is a muscle like any other in this regard. Would you strengthen your muscles better moving very light weights for hours a week or much heavier weights a few times a week?
I'm not saying that aerobic work is useless. Its good to move and be active. There are benefits. But real cardio training is training that is intense and brief in duration. Brief because you really couldn't do more.



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