Adding lean muscle mass to your body is not something you do by accident. There are proven principals that work no matter your age, gender or current level of fitness. But as with all things, some ARE more important than others. With that in mind here is my list of things, in order of priority that you should incorporate into any weight lifting routine that is geared to muscle mass building.
Keep Each Workout Under 1:30
This is basically the law of diminishing returns. With each set performed, your energy level drops to the point where you are not able to truly push your self enough to build muscle. The same theory applies to rep count. Doing 6-8 of the highest weight you can handle builds more muscle than failing on the 50th rep. It has been scientifically proven that any session beyond your bodies limit is counterproductive. That number seems to max out at 90 minutes.
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