Your lean body mass is the amount of weight you carry on your body that isn’t fat. The goal of any bodybuilder or fitness enthusiast is to drop weight while keeping your lean body mass the same. Find out how to calculate your LBM right here!
This is the Target Range or Zone that you want to stay in when doing any type of cardiovascular (aerobic) activity. When in this range your body is getting an optimum workout with maximum benefit, and it stays in a Fat Burning mode.