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If you are looking to build muscle mass, you won't want to do excessive amounts of high intensity, or long duration cardiovascular activity, mainly because you will be expending a lot of energy by doing this and will therefore have to intake more nutrients or your body will pull them from what you already have. So if you are needing to lose a fair amount of fat then you can do more cardio, while if you are already lean you should do less cardio. Typically start at 3 times/week for 20 min. and see how that works, then adjust from there.
|Jennifer Mathes, Ph.D.|