Fat and muscle are two completely different types of tissue. One can’t turn into the other. Fat is a soft, bulky, voluminous, lumpy yellow color tissue that sits on top of our muscle. Muscle is a lean, hard, firm and tight tissue. To achieve the body that most of us desire, we need to increase our muscle and decrease the layer of fat that sits on top of it. This is accomplished best through strength training and a low fat diet.