Training glossaryFundamentals & measures
Lean mass
Lean mass is the body weight that is not fat, including muscle, water, bones, organs and other tissues.
Also known as: Lean body mass
In everyday gym language, lean mass often becomes a synonym for muscle, but technically it includes everything that is not fat mass.
For tracking training, it helps interpret weight changes: gaining strength and muscle measurements can move the scale even without a proportional increase in fat.
See also
Sources
Scientific references behind this entry.
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