lean muscle building
It might be a lightly disturbing way to understand and remember it, but “lean muscle” in humans is the same as “lean meat” in the deli – meat that doesn’t come with fat along with it. Lean muscle even has its own measurement, called “lean muscle mass.”
This is your body weight but minus the weight from fat. Most people never know their lean body mass because it’s difficult to accurately determine outside of some complicated tests. The basic take-away is more muscle and less fat is good.