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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.
Lean body mass is the weight of a person's body that isn't fat. This includes muscle as well as bones and other nonfat tissue. A change in your lean body mass can dramatically affect your appearance, even if your total body weight doesn't change. You can estimate your lean body mass using several methods.