The recommended approach to gain muscle mass involves a combination of progressive resistance training and adequate nutrition. Individuals should engage in compound exercises, such as squats and deadlifts, which work for multiple muscle groups. It’s crucial to progressively increase weights to continue challenging the muscles. Concurrently, ensuring a diet rich in protein, carbohydrates, and healthy fats is vital to provide the necessary nutrients for recovery and growth. Consuming about 1.6-2.2 grams of protein per kilogram of body weight can aid in muscle repair and synthesis. Adequate rest and recovery are also key components of this process.