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Lean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.Lean muscle is less of a scientific term and more a term of art that refers to muscle that is independent of, and not obscured by, fat.ean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.
To Lean and Tone: You either have to maintain your lean mass and lose body fat or you have to increase lean muscle and lose body fat at the same time. One thing to keep in mind is lean muscle takes half the space as fat. One lb of fat takes up double the space that a lb of lean muscle does.