
Originally Posted by
BWhitaker
It depends what you are trying to get out of your "cardio"
Its all about heart rate, aerobic v. anaerobic, etc. For example, you energy source is different when doing anaerobic activity, such as lifting weights, and doing low intensity exercise targeting the 60-65% heartrate in a low intensity aerobic setting. Accordingly, you are training different "systems" of energy use and each will produce differing results, whether that be endurance, fat loss, increasing VO2 max, etc
So for someone wishing to gain the benefits of aerobic exercise, lifting weights in the manner you described would not be an efficient way of doing that.