Muscle gain refers to the process of increasing the size and strength of skeletal muscles through resistance training and proper nutrition. This typically involves exercises like weightlifting, which create small tears in muscle fibers. As the body repairs these tears, the muscles grow larger and stronger. To effectively gain muscle, individuals should consume a balanced diet rich in protein, which is essential for muscle repair and growth. Additionally, adequate rest and recovery are crucial, as muscles need time to heal and adapt after workouts. Consistency in training and nutrition is key to achieving significant muscle gain over time.