The method is:

1. Boil potato pieces with a little salt, and don't eat three meals.

If the skeleton is too small, go to the gym to exercise.

3. Ensure adequate sleep, because muscle growth is generated during sleep, and eat more high-protein foods in the diet, such as beef, chicken breast, boiled egg protein and so on.

Read fitness magazines when you have time, don't just gain weight, be firm, and don't just be fat.