Your body is composed of two types of mass: body fat and fat-free mass.  

  • Body fat is fat that is located within the body. Body fat can be in muscle tissue, under the skin or around organs. Some fat is necessary for overall health. It helps protect internal organs, provides energy and regulates important body hormones. 
  • Fat-free mass includes bone, water, muscle, and tissues. Fat-free mass is also important for the body to function properly.  

Body Composition refers to the proportion of fat and fat-free mass in the body. A healthy body composition is one that includes a lower proportion of body fat and a higher proportion of fat-free mass. Body composition is one measurement that is used to assess your health and fitness level.