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. Higher muscle mass can improve strength, endurance, and metabolism, making it easier to maintain a healthy weight. Factors that influence muscle mass include genetics, age, diet, and physical activity. Engaging in regular exercise, particularly strength training, can help increase muscle mass. Adequate protein intake is also essential for muscle growth and repair, supporting overall fitness and health.