The process of exercise is actually the process of muscle wear, and the growth of muscle is the same as that of cocoon. By fighting against wear and tear, muscles feel "pressure" and are willing to grow against your training, and muscles will grow. Of course, this also requires full rest after exercise (except for abdominal muscles, other muscles need to rest for at least 48 hours to recover after exercise, and abdominal muscles can rest for 24 hours), and protein supplements needed for muscle growth can make muscles grow (foods rich in protein include: beef, chicken breast, salmon, shrimp, egg white, milk, avocado, etc.). And the best eating effect is within 2 hours after training).