The right answer is Lean body mass.
Lean mass, as opposed to fat mass, represents the weight share of muscles, viscera, bones and water. It's the total weight of your body minus all the weight due to your body fat.
Lean Body Mass (LBM) = Total Weight - Fatty Mass.
LBM includes the weight of:
- Organs
- Skin
- Bones
- Body water
- Muscular mass