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For most folks it can't.

I believe most people spend far to much time on Cardio, and not nearly enough time developing their muscles. You get so much benefit in terms of metabolic changes from muscle building that it should be a part of any work-out. Cardio is important, no question. If your goal, however, is to change your physique you will get much more mileage from weight-lifting. This includes just a general weight-loss goal.

Really, I try to shoot for the fitness tri-fecta: * Eat right (in my case a high calorie diet with lots of vegetables protein, and dietary fat) * Build muscle (by lifting heavy objects multiple times, primarily through big compound exercises like squats and dead-lifts) * Build endurance with a cardio program (I alternate with my muscle building program)




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