It is also known as lean muscle mass.

If you'd rather take a more conservative approach (and in my mind better), you'll take in a surplus of calories, but won't go hog crazy. About 200-400 above maintenance should be plenty to get the Muscle Building process going.
 Rexburn
29 Week Step by Step Beginners Intensive Workout Program accessed through a website. This has great videos which Muscle Building Review show you exactly what to do and how to do it. Plus tons of other extras.

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