Lean body mass

Lean body mass is all the stuff in your body that isn't fat. It includes your muscles, bones, organs, and other tissues. When you exercise and eat healthy foods, you can build up your lean body mass. This is really important for being strong and healthy. Your lean body mass helps you do things like run, jump, and play without feeling tired. It also helps your body burn calories and stay at a good weight, which means you can stay healthy and happy for a long time!