Muscle mass refers to the amount of muscle tissue in the body. It is an important component of overall body composition, which also includes fat, bone, and water. Muscle mass contributes to strength, endurance, and metabolism, playing a crucial role in physical performance and health. Increasing muscle mass can be achieved through resistance training, such as weightlifting, and proper nutrition, including adequate protein intake. Maintaining a healthy level of muscle mass is essential for mobility, injury prevention, and overall well-being, especially as people age. Regular exercise and a balanced diet are key factors in promoting muscle growth and maintenance.