1.   You could exercise to increase the amount of lean muscle tissue and Decrease the amount of fat in your body.

2.   As she gets older and continues to train vigorously, Popson and Cohen also expect Haworth to replace some of her body fat with lean muscle.

3.   Creatin supposedly allows users to recover from workouts quicker while building lean muscle mass and, it is not a steroid or other banned substance.

4.   In addition, very low-calorie diets promote loss of lean muscle mass as well as body fat.

5.   Lean muscle burns more energy than fat.

6.   Marbling is small flecks of fat in lean muscle, contributing to juiciness, flavor and tenderness.

7.   More important, researchers say, is the gradual loss of lean muscle mass that occurs throughout middle and old age.

8.   Proponents say it tightens skin, increases libido, improves cardiovascular capacity and boosts lean muscle mass.

9.   That means thyroid-stimulating hormones can be sold as fat-burning supplements, and bodybuilders can swallow testosterone analogues in the hopes of building lean muscle.