There's a fine line between doing too much cardio and not enough when it comes to building muscle mass while trying staying lean. Too much cardio without enough calories will bring you into a catabolic state and you will lose muscle. If you're doing a lot of vigorous exercises like running, supplements can help. You may also need to increase you caloric intake.
Last edited by Frontline; 05-13-2009 at 08:31 AM.
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